XPath: Moved implementation to pugixml.cpp

git-svn-id: http://pugixml.googlecode.com/svn/trunk@670 99668b35-9821-0410-8761-19e4c4f06640

2 files changed, 3851 insertions, 3890 deletions

diff --git a/src/pugixml.cpp b/src/pugixml.cpp
index d319069..db9564c 100644
--- a/src/pugixml.cpp
+++ b/src/pugixml.cpp
@@ -4496,6 +4496,3857 @@ namespace std
 }
 #endif
 
+#ifndef PUGIXML_NO_XPATH
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <setjmp.h>
+#include <ctype.h>
+#include <math.h>
+#include <float.h>
+
+#ifdef PUGIXML_WCHAR_MODE
+#	include <wchar.h>
+#endif
+
+#include <new>
+
+#ifndef PUGIXML_NO_STL
+#	include <string>
+#endif
+
+// int32_t
+#if !defined(_MSC_VER) || _MSC_VER >= 1600
+#	include <stdint.h>
+#else
+typedef __int32 int32_t;
+#endif
+
+#if defined(_MSC_VER)
+#	pragma warning(disable: 4127) // conditional expression is constant
+#	pragma warning(disable: 4324) // structure was padded due to __declspec(align())
+#	pragma warning(disable: 4611) // interaction between '_setjmp' and C++ object destruction is non-portable
+#	pragma warning(disable: 4702) // unreachable code
+#	pragma warning(disable: 4996) // this function or variable may be unsafe
+#endif
+
+#ifdef __INTEL_COMPILER
+#	pragma warning(disable: 1478 1786) // function was declared "deprecated"
+#endif
+
+#ifdef __SNC__
+#	pragma diag_suppress=237 // controlling expression is constant
+#endif
+
+// String utilities prototypes
+namespace pugi
+{
+	namespace impl
+	{
+		size_t strlen(const char_t* s);
+		bool strequal(const char_t* src, const char_t* dst);
+		bool strequalrange(const char_t* lhs, const char_t* rhs, size_t count);
+		void widen_ascii(wchar_t* dest, const char* source);
+	}
+}
+
+// STL replacements
+namespace pstd
+{
+	struct equal_to
+	{
+		template <typename T> bool operator()(const T& lhs, const T& rhs) const
+		{
+			return lhs == rhs;
+		}
+	};
+
+	struct not_equal_to
+	{
+		template <typename T> bool operator()(const T& lhs, const T& rhs) const
+		{
+			return lhs != rhs;
+		}
+	};
+
+	struct less
+	{
+		template <typename T> bool operator()(const T& lhs, const T& rhs) const
+		{
+			return lhs < rhs;
+		}
+	};
+
+	struct less_equal
+	{
+		template <typename T> bool operator()(const T& lhs, const T& rhs) const
+		{
+			return lhs <= rhs;
+		}
+	};
+
+	template <typename T> void swap(T& lhs, T& rhs)
+	{
+		T temp = lhs;
+		lhs = rhs;
+		rhs = temp;
+	}
+
+	template <typename I, typename J> void copy(I begin, I end, J target)
+	{
+		while (begin != end) *target++ = *begin++;
+	}
+
+	template <typename I, typename T> I find(I begin, I end, T elem)
+	{
+		for (I it = begin; it != end; ++it)
+			if (*it == elem)
+				return it;
+
+		return end;
+	}
+
+	template <typename I, typename Pred> I min_element(I begin, I end, const Pred& pred)
+	{
+		I result = begin;
+
+		for (I it = begin + 1; it != end; ++it)
+			if (pred(*it, *result))
+				result = it;
+
+		return result;
+	}
+
+	template <typename I> void reverse(I begin, I end)
+	{
+		while (begin + 1 < end) swap(*begin++, *--end);
+	}
+
+	template <typename I> I unique(I begin, I end)
+	{
+		// fast skip head
+		while (begin + 1 < end && *begin != *(begin + 1)) begin++;
+
+		if (begin == end) return begin;
+
+		// last written element
+		I write = begin++; 
+
+		// merge unique elements
+		while (begin != end)
+		{
+			if (*begin != *write)
+				*++write = *begin++;
+			else
+				begin++;
+		}
+
+		// past-the-end (write points to live element)
+		return write + 1;
+	}
+
+	template <typename I, typename Pred> void sort(I begin, I end, const Pred& pred)
+	{
+		while (begin != end) swap(*begin, *min_element(begin, end, pred)), begin++;
+	}
+}
+
+namespace
+{
+	using namespace pugi;
+
+	class xpath_string
+	{
+		const char_t* _buffer;
+		bool _uses_heap;
+
+		static char_t* duplicate_string(const char_t* string, size_t length)
+		{
+			char_t* result = static_cast<char_t*>(get_memory_allocation_function()((length + 1) * sizeof(char_t)));
+			if (!result) return 0; // $$ out of memory
+
+			memcpy(result, string, length * sizeof(char_t));
+			result[length] = 0;
+
+			return result;
+		}
+
+		static char_t* duplicate_string(const char_t* string)
+		{
+			return duplicate_string(string, impl::strlen(string));
+		}
+
+	public:
+		xpath_string(): _buffer(PUGIXML_TEXT("")), _uses_heap(false)
+		{
+		}
+
+		~xpath_string()
+		{
+			if (_uses_heap) get_memory_deallocation_function()(const_cast<char_t*>(_buffer));
+		}
+
+		explicit xpath_string(const char_t* str)
+		{
+			bool empty = (*str == 0);
+
+			_buffer = empty ? PUGIXML_TEXT("") : duplicate_string(str);
+			_uses_heap = !empty;
+		}
+
+		explicit xpath_string(const char_t* str, bool use_heap): _buffer(str), _uses_heap(use_heap)
+		{
+		}
+
+		xpath_string(const char_t* begin, const char_t* end)
+		{
+			assert(begin <= end);
+
+			if (begin != end)
+			{
+				_buffer = duplicate_string(begin, static_cast<size_t>(end - begin));
+				_uses_heap = true;
+			}
+			else
+			{
+				_buffer = PUGIXML_TEXT("");
+				_uses_heap = false;
+			}
+		}
+
+		xpath_string(const xpath_string& o)
+		{
+			_buffer = o._uses_heap ? duplicate_string(o._buffer) : o._buffer;
+			_uses_heap = o._uses_heap;
+		}
+
+		xpath_string& operator=(const xpath_string& o)
+		{
+			xpath_string temp(o);
+			swap(temp);
+
+			return *this;
+		}
+
+		void swap(xpath_string& o)
+		{
+			pstd::swap(_buffer, o._buffer);
+			pstd::swap(_uses_heap, o._uses_heap);
+		}
+
+		void append(const xpath_string& o)
+		{
+			// skip empty sources
+			if (!*o._buffer) return;
+
+			// fast append for empty target and constant source
+			if (!*_buffer && !o._uses_heap)
+			{
+				_buffer = o._buffer;
+				_uses_heap = false;
+			}
+			else
+			{
+				// need to make heap copy
+				size_t target_length = impl::strlen(_buffer);
+				size_t source_length = impl::strlen(o._buffer);
+				size_t length = target_length + source_length;
+
+				// allocate new buffer
+				char_t* result = static_cast<char_t*>(get_memory_allocation_function()((length + 1) * sizeof(char_t)));
+				if (!result) return; // $$ out of memory
+
+				// append both strings in the new buffer
+				memcpy(result, _buffer, target_length * sizeof(char_t));
+				memcpy(result + target_length, o._buffer, source_length * sizeof(char_t));
+				result[length] = 0;
+
+				// finalize
+				xpath_string(result, true).swap(*this);
+			}
+		}
+
+		const char_t* c_str() const
+		{
+			return _buffer;
+		}
+
+		size_t length() const
+		{
+			return impl::strlen(_buffer);
+		}
+		
+		char_t* data()
+		{
+			// make private heap copy
+			if (!_uses_heap)
+			{
+				_buffer = duplicate_string(_buffer);
+				_uses_heap = true;
+			}
+
+			return const_cast<char_t*>(_buffer);
+		}
+
+		bool empty() const
+		{
+			return *_buffer == 0;
+		}
+
+		bool operator==(const xpath_string& o) const
+		{
+			return impl::strequal(_buffer, o._buffer);
+		}
+
+		bool operator!=(const xpath_string& o) const
+		{
+			return !impl::strequal(_buffer, o._buffer);
+		}
+	};
+
+	xpath_string xpath_string_const(const char_t* str)
+	{
+		return xpath_string(str, false);
+	}
+}
+
+namespace
+{
+	using namespace pugi;
+		
+	enum chartypex
+	{
+		ctx_space = 1,			// \r, \n, space, tab
+		ctx_start_symbol = 2,	// Any symbol > 127, a-z, A-Z, _
+		ctx_digit = 4,			// 0-9
+		ctx_symbol = 8			// Any symbol > 127, a-z, A-Z, 0-9, _, -, .
+	};
+	
+	const unsigned char chartypex_table[256] =
+	{
+		0,  0,  0,  0,  0,  0,  0,  0,     0,  1,  1,  0,  0,  1,  0,  0,     // 0-15
+		0,  0,  0,  0,  0,  0,  0,  0,     0,  0,  0,  0,  0,  0,  0,  0,     // 16-31
+		1,  0,  0,  0,  0,  0,  0,  0,     0,  0,  0,  0,  0,  8,  8,  0,     // 32-47
+		12, 12, 12, 12, 12, 12, 12, 12,    12, 12, 0,  0,  0,  0,  0,  0,     // 48-63
+		0,  10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,    // 64-79
+		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 0,  0,  0,  0,  10,    // 80-95
+		0,  10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,    // 96-111
+		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 0,  0,  0,  0,  0,     // 112-127
+
+		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,    // 128+
+		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
+		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
+		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
+		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
+		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
+		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
+		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10
+	};
+	
+#ifdef PUGIXML_WCHAR_MODE
+	#define IS_CHARTYPEX(c, ct) ((static_cast<unsigned int>(c) < 128 ? chartypex_table[static_cast<unsigned int>(c)] : chartypex_table[128]) & (ct))
+#else
+	#define IS_CHARTYPEX(c, ct) (chartypex_table[static_cast<unsigned char>(c)] & (ct))
+#endif
+
+	bool starts_with(const char_t* string, const char_t* pattern)
+	{
+		while (*pattern && *string == *pattern)
+		{
+			string++;
+			pattern++;
+		}
+
+		return *pattern == 0;
+	}
+
+	const char_t* find_char(const char_t* s, char_t c)
+	{
+	#ifdef PUGIXML_WCHAR_MODE
+		return wcschr(s, c);
+	#else
+		return strchr(s, c);
+	#endif
+	}
+
+	const char_t* find_substring(const char_t* s, const char_t* p)
+	{
+	#ifdef PUGIXML_WCHAR_MODE
+		return wcsstr(s, p);
+	#else
+		return strstr(s, p);
+	#endif
+	}
+
+	xpath_string string_value(const xpath_node& na)
+	{
+		if (na.attribute())
+			return xpath_string_const(na.attribute().value());
+		else
+		{
+			const xml_node& n = na.node();
+
+			switch (n.type())
+			{
+			case node_pcdata:
+			case node_cdata:
+			case node_comment:
+			case node_pi:
+				return xpath_string_const(n.value());
+			
+			case node_document:
+			case node_element:
+			{
+				xpath_string result;
+
+				xml_node cur = n.first_child();
+				
+				while (cur && cur != n)
+				{
+					if (cur.type() == node_pcdata || cur.type() == node_cdata)
+						result.append(xpath_string_const(cur.value()));
+
+					if (cur.first_child())
+						cur = cur.first_child();
+					else if (cur.next_sibling())
+						cur = cur.next_sibling();
+					else
+					{
+						while (!cur.next_sibling() && cur != n)
+							cur = cur.parent();
+
+						if (cur != n) cur = cur.next_sibling();
+					}
+				}
+				
+				return result;
+			}
+			
+			default:
+				return xpath_string();
+			}
+		}
+	}
+	
+	unsigned int node_height(xml_node n)
+	{
+	    unsigned int result = 0;
+	    
+	    while (n)
+	    {
+	        ++result;
+	        n = n.parent();
+	    }
+	    
+	    return result;
+	}
+	
+	// precondition: node_height of ln is <= node_height of rn, ln != rn
+	bool node_is_before(xml_node ln, unsigned int lh, xml_node rn, unsigned int rh)
+	{
+	    assert(lh <= rh);
+	    
+	    while (lh < rh)
+	    {
+	        --rh;
+	        rn = rn.parent();
+	    }
+	    
+	    if (ln == rn) return true;
+	    
+	    while (ln.parent() != rn.parent())
+	    {
+	        ln = ln.parent();
+	        rn = rn.parent();
+	    }
+	    
+        for (; ln; ln = ln.next_sibling())
+            if (ln == rn)
+                return true;
+                
+        return false;
+    }
+
+    bool node_is_ancestor(xml_node parent, xml_node node)
+    {
+    	while (node && node != parent) node = node.parent();
+
+    	return parent && node == parent;
+    }
+    
+	struct document_order_comparator
+	{
+		bool operator()(const xpath_node& lhs, const xpath_node& rhs) const
+		{
+			xml_node ln = lhs.node(), rn = rhs.node();
+
+			const void* lo = lhs.attribute() ? lhs.attribute().document_order() : ln.document_order();
+			const void* ro = rhs.attribute() ? rhs.attribute().document_order() : rn.document_order();
+
+			if (lo && ro) return lo < ro;
+
+			if (lhs.attribute() && rhs.attribute())
+			{
+				if (lhs.parent() == rhs.parent())
+				{
+				    for (xml_attribute a = lhs.attribute(); a; a = a.next_attribute())
+				        if (a == rhs.attribute())
+				            return true;
+				    
+				    return false;
+				}
+				
+				ln = lhs.parent();
+				rn = rhs.parent();
+			}
+			else if (lhs.attribute())
+			{
+				if (lhs.parent() == rhs.node()) return false;
+				
+				ln = lhs.parent();
+			}
+			else if (rhs.attribute())
+			{
+				if (rhs.parent() == lhs.node()) return true;
+				
+				rn = rhs.parent();
+			}
+
+			if (ln == rn) return false;
+			
+			unsigned int lh = node_height(ln);
+			unsigned int rh = node_height(rn);
+			
+			return (lh <= rh) ? node_is_before(ln, lh, rn, rh) : !node_is_before(rn, rh, ln, lh);
+		}
+	};
+
+	struct duplicate_comparator
+	{
+		bool operator()(const xpath_node& lhs, const xpath_node& rhs) const
+		{
+			if (lhs.attribute()) return rhs.attribute() ? lhs.attribute() < rhs.attribute() : true;
+			else return rhs.attribute() ? false : lhs.node() < rhs.node();
+		}
+	};
+	
+	double gen_nan()
+	{
+	#if defined(__STDC_IEC_559__) || ((FLT_RADIX - 0 == 2) && (FLT_MAX_EXP - 0 == 128) && (FLT_MANT_DIG - 0 == 24))
+		union { float f; int32_t i; } u[sizeof(float) == sizeof(int32_t) ? 1 : -1];
+		u[0].i = 0x7fc00000;
+		return u[0].f;
+	#else
+		// fallback
+		const volatile double zero = 0.0;
+		return zero / zero;
+	#endif
+	}
+	
+	bool is_nan(double value)
+	{
+	#if defined(_MSC_VER) || defined(__BORLANDC__)
+		return !!_isnan(value);
+	#elif defined(fpclassify) && defined(FP_NAN)
+		return fpclassify(value) == FP_NAN;
+	#else
+		// fallback
+		const volatile double v = value;
+		return v != v;
+	#endif
+	}
+	
+	const char_t* convert_number_to_string_special(double value)
+	{
+	#if defined(_MSC_VER) || defined(__BORLANDC__)
+		if (_finite(value)) return (value == 0) ? PUGIXML_TEXT("0") : 0;
+		if (_isnan(value)) return PUGIXML_TEXT("NaN");
+		return PUGIXML_TEXT("-Infinity") + (value > 0);
+	#elif defined(fpclassify) && defined(FP_NAN) && defined(FP_INFINITE) && defined(FP_ZERO)
+		switch (fpclassify(value))
+		{
+		case FP_NAN:
+			return PUGIXML_TEXT("NaN");
+
+		case FP_INFINITE:
+			return PUGIXML_TEXT("-Infinity") + (value > 0);
+
+		case FP_ZERO:
+			return PUGIXML_TEXT("0");
+
+		default:
+			return 0;
+		}
+	#else
+		// fallback
+		const volatile double v = value;
+
+		if (v == 0) return PUGIXML_TEXT("0");
+		if (v != v) return PUGIXML_TEXT("NaN");
+		if (v * 2 == v) return PUGIXML_TEXT("-Infinity") + (value > 0);
+		return 0;
+	#endif
+	}
+	
+	bool convert_number_to_boolean(double value)
+	{
+		return (value != 0 && !is_nan(value));
+	}
+	
+	void truncate_zeros(char* begin, char* end)
+	{
+		while (begin != end && end[-1] == '0') end--;
+
+		*end = 0;
+	}
+
+	// gets mantissa digits in the form of 0.xxxxx with 0. implied and the exponent
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+	void convert_number_to_mantissa_exponent(double value, char* buffer, size_t buffer_size, char** out_mantissa, int* out_exponent)
+	{
+		// get base values
+		int sign, exponent;
+		_ecvt_s(buffer, buffer_size, value, DBL_DIG + 1, &exponent, &sign);
+
+		// truncate redundant zeros
+		truncate_zeros(buffer, buffer + strlen(buffer));
+
+		// fill results
+		*out_mantissa = buffer;
+		*out_exponent = exponent;
+	}
+#else
+	void convert_number_to_mantissa_exponent(double value, char* buffer, size_t buffer_size, char** out_mantissa, int* out_exponent)
+	{
+		// get a scientific notation value with IEEE DBL_DIG decimals
+		sprintf(buffer, "%.*e", DBL_DIG, value);
+		assert(strlen(buffer) < buffer_size);
+		(void)!buffer_size;
+
+		// get the exponent (possibly negative)
+		char* exponent_string = strchr(buffer, 'e');
+		assert(exponent_string);
+
+		int exponent = atoi(exponent_string + 1);
+
+		// extract mantissa string: skip sign
+		char* mantissa = buffer[0] == '-' ? buffer + 1 : buffer;
+		assert(mantissa[0] != '0' && mantissa[1] == '.');
+
+		// divide mantissa by 10 to eliminate integer part
+		mantissa[1] = mantissa[0];
+		mantissa++;
+		exponent++;
+
+		// remove extra mantissa digits and zero-terminate mantissa
+		truncate_zeros(mantissa, exponent_string);
+
+		// fill results
+		*out_mantissa = mantissa;
+		*out_exponent = exponent;
+	}
+#endif
+
+	xpath_string convert_number_to_string(double value)
+	{
+		// try special number conversion
+		const char_t* special = convert_number_to_string_special(value);
+		if (special) return xpath_string_const(special);
+
+		// get mantissa + exponent form
+		char mantissa_buffer[64];
+
+		char* mantissa;
+		int exponent;
+		convert_number_to_mantissa_exponent(value, mantissa_buffer, sizeof(mantissa_buffer), &mantissa, &exponent);
+
+		// make the number!
+		char_t result[512];
+		char_t* s = result;
+
+		// sign
+		if (value < 0) *s++ = '-';
+
+		// integer part
+		if (exponent <= 0)
+		{
+			*s++ = '0';
+		}
+		else
+		{
+			while (exponent > 0)
+			{
+				assert(*mantissa == 0 || (unsigned)(*mantissa - '0') <= 9);
+				*s++ = *mantissa ? *mantissa++ : '0';
+				exponent--;
+			}
+		}
+
+		// fractional part
+		if (*mantissa)
+		{
+			// decimal point
+			*s++ = '.';
+
+			// extra zeroes from negative exponent
+			while (exponent < 0)
+			{
+				*s++ = '0';
+				exponent++;
+			}
+
+			// extra mantissa digits
+			while (*mantissa)
+			{
+				assert((unsigned)(*mantissa - '0') <= 9);
+				*s++ = *mantissa++;
+			}
+		}
+
+		// zero-terminate
+		assert(s < result + sizeof(result) / sizeof(result[0]));
+		*s = 0;
+
+		return xpath_string(result);
+	}
+	
+	bool check_string_to_number_format(const char_t* string)
+	{
+		// parse leading whitespace
+		while (IS_CHARTYPEX(*string, ctx_space)) ++string;
+
+		// parse sign
+		if (*string == '-') ++string;
+
+		if (!*string) return false;
+
+		// if there is no integer part, there should be a decimal part with at least one digit
+		if (!IS_CHARTYPEX(string[0], ctx_digit) && (string[0] != '.' || !IS_CHARTYPEX(string[1], ctx_digit))) return false;
+
+		// parse integer part
+		while (IS_CHARTYPEX(*string, ctx_digit)) ++string;
+
+		// parse decimal part
+		if (*string == '.')
+		{
+			++string;
+
+			while (IS_CHARTYPEX(*string, ctx_digit)) ++string;
+		}
+
+		// parse trailing whitespace
+		while (IS_CHARTYPEX(*string, ctx_space)) ++string;
+
+		return *string == 0;
+	}
+
+	double convert_string_to_number(const char_t* string)
+	{
+		// check string format
+		if (!check_string_to_number_format(string)) return gen_nan();
+
+		// parse string
+	#ifdef PUGIXML_WCHAR_MODE
+		return wcstod(string, 0);
+	#else
+		return atof(string);
+	#endif
+	}
+
+	bool convert_string_to_number(const char_t* begin, const char_t* end, double* out_result)
+	{
+		char_t buffer[32];
+
+		size_t length = static_cast<size_t>(end - begin);
+		char_t* scratch = buffer;
+
+		if (length >= sizeof(buffer) / sizeof(buffer[0]))
+		{
+			// need to make dummy on-heap copy
+			scratch = static_cast<char_t*>(get_memory_allocation_function()((length + 1) * sizeof(char_t)));
+			if (!scratch) return false;
+		}
+
+		// copy string to zero-terminated buffer and perform conversion
+		memcpy(scratch, begin, length * sizeof(char_t));
+		scratch[length] = 0;
+
+		*out_result = convert_string_to_number(scratch);
+
+		// free dummy buffer
+		if (scratch != buffer) get_memory_deallocation_function()(scratch);
+
+		return true;
+	}
+	
+	double round_nearest(double value)
+	{
+		return floor(value + 0.5);
+	}
+
+	double round_nearest_nzero(double value)
+	{
+		// same as round_nearest, but returns -0 for [-0.5, -0]
+		// ceil is used to differentiate between +0 and -0 (we return -0 for [-0.5, -0] and +0 for +0)
+		return (value >= -0.5 && value <= 0) ? ceil(value) : floor(value + 0.5);
+	}
+	
+	const char_t* qualified_name(const xpath_node& node)
+	{
+		return node.attribute() ? node.attribute().name() : node.node().name();
+	}
+	
+	const char_t* local_name(const xpath_node& node)
+	{
+		const char_t* name = qualified_name(node);
+		const char_t* p = find_char(name, ':');
+		
+		return p ? p + 1 : name;
+	}
+
+	struct namespace_uri_predicate
+	{
+		const char_t* prefix;
+		size_t prefix_length;
+
+		namespace_uri_predicate(const char_t* name)
+		{
+			const char_t* pos = find_char(name, ':');
+
+			prefix = pos ? name : 0;
+			prefix_length = pos ? static_cast<size_t>(pos - name) : 0;
+		}
+
+		bool operator()(const xml_attribute& a) const
+		{
+			const char_t* name = a.name();
+
+			if (!starts_with(name, PUGIXML_TEXT("xmlns"))) return false;
+
+			return prefix ? name[5] == ':' && impl::strequalrange(name + 6, prefix, prefix_length) : name[5] == 0;
+		}
+	};
+
+	const char_t* namespace_uri(const xml_node& node)
+	{
+		namespace_uri_predicate pred = node.name();
+		
+		xml_node p = node;
+		
+		while (p)
+		{
+			xml_attribute a = p.find_attribute(pred);
+			
+			if (a) return a.value();
+			
+			p = p.parent();
+		}
+		
+		return PUGIXML_TEXT("");
+	}
+
+	const char_t* namespace_uri(const xml_attribute& attr, const xml_node& parent)
+	{
+		namespace_uri_predicate pred = attr.name();
+		
+		// Default namespace does not apply to attributes
+		if (!pred.prefix) return PUGIXML_TEXT("");
+		
+		xml_node p = parent;
+		
+		while (p)
+		{
+			xml_attribute a = p.find_attribute(pred);
+			
+			if (a) return a.value();
+			
+			p = p.parent();
+		}
+		
+		return PUGIXML_TEXT("");
+	}
+
+	const char_t* namespace_uri(const xpath_node& node)
+	{
+		return node.attribute() ? namespace_uri(node.attribute(), node.parent()) : namespace_uri(node.node());
+	}
+
+	void normalize_space(char_t* buffer)
+	{
+		char_t* write = buffer;
+
+		for (char_t* it = buffer; *it; )
+		{
+			char_t ch = *it++;
+
+			if (IS_CHARTYPEX(ch, ctx_space))
+			{
+				// replace whitespace sequence with single space
+				while (IS_CHARTYPEX(*it, ctx_space)) it++;
+
+				// avoid leading spaces
+				if (write != buffer) *write++ = ' ';
+			}
+			else *write++ = ch;
+		}
+
+		// remove trailing space
+		if (write != buffer && IS_CHARTYPEX(write[-1], ctx_space)) write--;
+
+		// zero-terminate
+		*write = 0;
+	}
+
+	void translate(char_t* buffer, const char_t* from, const char_t* to)
+	{
+		size_t to_length = impl::strlen(to);
+
+		char_t* write = buffer;
+
+		while (*buffer)
+		{
+		#ifdef __DMC__
+			volatile // explicitly store to local to work around DMC bug (it loads 4 bytes from buffer otherwise)
+		#endif
+			char_t ch = *buffer++;
+
+			const char_t* pos = find_char(from, ch);
+
+			if (!pos)
+				*write++ = ch; // do not process
+			else if (static_cast<size_t>(pos - from) < to_length)
+				*write++ = to[pos - from]; // replace
+		}
+
+		// zero-terminate
+		*write = 0;
+	}
+}
+
+namespace pugi
+{
+#ifndef PUGIXML_NO_EXCEPTIONS
+	xpath_exception::xpath_exception(const xpath_parse_result& result): _result(result)
+	{
+		assert(result.error);
+	}
+	
+	const char* xpath_exception::what() const throw()
+	{
+		return _result.error;
+	}
+
+	const xpath_parse_result& xpath_exception::result() const
+	{
+		return _result;
+	}
+#endif
+	
+	const size_t xpath_memory_block_size = 4096;
+
+	class xpath_allocator
+	{
+		struct memory_block
+		{	
+			memory_block* next;
+	
+			char data[xpath_memory_block_size];
+		};
+		
+		memory_block* _root;
+		size_t _root_size;
+
+		memory_block _first;
+		
+	public:
+		static xpath_allocator* create()
+		{
+			void* memory = get_memory_allocation_function()(sizeof(xpath_allocator));
+
+			return new (memory) xpath_allocator();
+		}
+
+		static void destroy(xpath_allocator* alloc)
+		{
+			if (!alloc) return;
+			
+			// free all allocated pages
+			memory_block* cur = alloc->_root;
+			memory_block* first = &alloc->_first;
+
+			while (cur != first)
+			{
+				memory_block* next = cur->next;
+
+				get_memory_deallocation_function()(cur);
+
+				cur = next;
+			}
+
+			// free allocator memory (with the first page)
+			get_memory_deallocation_function()(alloc);
+		}
+
+		xpath_allocator()
+		{
+			_root = &_first;
+			_root_size = 0;
+			_first.next = 0;
+		}
+		
+		void* allocate(size_t size)
+		{
+			// align size so that we're able to store pointers in subsequent blocks
+			size = (size + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
+
+			if (_root_size + size <= xpath_memory_block_size)
+			{
+				void* buf = _root->data + _root_size;
+				_root_size += size;
+				return buf;
+			}
+			else
+			{
+				size_t block_data_size = (size > xpath_memory_block_size) ? size : xpath_memory_block_size;
+				size_t block_size = block_data_size + offsetof(memory_block, data);
+
+				memory_block* block = static_cast<memory_block*>(get_memory_allocation_function()(block_size));
+				if (!block) return 0;
+				
+				block->next = _root;
+				
+				_root = block;
+				_root_size = size;
+				
+				return block->data;
+			}
+		}
+	};
+
+	xpath_node::xpath_node()
+	{
+	}
+		
+	xpath_node::xpath_node(const xml_node& node): _node(node)
+	{
+	}
+		
+	xpath_node::xpath_node(const xml_attribute& attribute, const xml_node& parent): _node(parent), _attribute(attribute)
+	{
+	}
+
+	xml_node xpath_node::node() const
+	{
+		return _attribute ? xml_node() : _node;
+	}
+		
+	xml_attribute xpath_node::attribute() const
+	{
+		return _attribute;
+	}
+	
+	xml_node xpath_node::parent() const
+	{
+		return _attribute ? _node : _node.parent();
+	}
+
+	xpath_node::operator xpath_node::unspecified_bool_type() const
+	{
+		return (_node || _attribute) ? &xpath_node::_node : 0;
+	}
+	
+	bool xpath_node::operator!() const
+	{
+		return !(_node || _attribute);
+	}
+
+	bool xpath_node::operator==(const xpath_node& n) const
+	{
+		return _node == n._node && _attribute == n._attribute;
+	}
+	
+	bool xpath_node::operator!=(const xpath_node& n) const
+	{
+		return _node != n._node || _attribute != n._attribute;
+	}
+
+#ifdef __BORLANDC__
+	bool operator&&(const xpath_node& lhs, bool rhs)
+	{
+		return (bool)lhs && rhs;
+	}
+
+	bool operator||(const xpath_node& lhs, bool rhs)
+	{
+		return (bool)lhs || rhs;
+	}
+#endif
+
+	xpath_node_set::xpath_node_set(): _type(type_unsorted), _begin(&_storage), _end(&_storage), _eos(&_storage + 1)
+	{
+	}
+
+	xpath_node_set::~xpath_node_set()
+	{
+		if (_begin != &_storage) get_memory_deallocation_function()(_begin);
+	}
+		
+	xpath_node_set::xpath_node_set(const xpath_node_set& ns): _type(ns._type), _begin(&_storage), _end(&_storage), _eos(&_storage + 1)
+	{
+		if (ns.size() == 1)
+		{
+			_storage = *ns._begin;
+			_end = _eos;
+		}
+		else
+		{
+			append(ns.begin(), ns.end());
+		}
+	}
+	
+	xpath_node_set& xpath_node_set::operator=(const xpath_node_set& ns)
+	{
+		if (this == &ns) return *this;
+		
+		// clear & append
+		_type = ns._type;
+		_end = _begin;
+		
+		append(ns.begin(), ns.end());
+		
+		return *this;
+	}
+
+	void xpath_node_set::swap(xpath_node_set& ns)
+	{
+		pstd::swap(_type, ns._type);
+		pstd::swap(_storage, ns._storage);
+		pstd::swap(_begin, ns._begin);
+		pstd::swap(_end, ns._end);
+		pstd::swap(_eos, ns._eos);
+	}
+
+	xpath_node_set::type_t xpath_node_set::type() const
+	{
+		return _type;
+	}
+		
+	size_t xpath_node_set::size() const
+	{
+		return _end - _begin;
+	}
+		
+	bool xpath_node_set::empty() const
+	{
+		return size() == 0;
+	}
+		
+	const xpath_node& xpath_node_set::operator[](size_t index) const
+	{
+		assert(index < size());
+		return _begin[index];
+	}
+
+	xpath_node_set::iterator xpath_node_set::mut_begin()
+	{
+		return _begin;
+	}
+	
+	xpath_node_set::const_iterator xpath_node_set::begin() const
+	{
+		return _begin;
+	}
+		
+	xpath_node_set::const_iterator xpath_node_set::end() const
+	{
+		return _end;
+	}
+	
+	void xpath_node_set::sort(bool reverse)
+	{
+		pstd::sort(_begin, _end, document_order_comparator());
+		
+		if (reverse) pstd::reverse(_begin, _end);
+			
+		_type = reverse ? type_sorted_reverse : type_sorted;
+	}
+
+	void xpath_node_set::push_back(const xpath_node& n)
+	{
+		if (_end == _eos)
+			append(&n, &n + 1);
+		else
+		{
+			*_end = n;
+			++_end;
+		}
+	}
+
+	void xpath_node_set::append(const_iterator begin, const_iterator end)
+	{
+		if (begin == end) return;
+
+		size_t count = end - begin;
+		size_t size = _end - _begin;
+		size_t capacity = _eos - _begin;
+		
+		if (capacity < size + count)
+		{
+			if (capacity < 2) capacity = 2;
+			
+			while (capacity < size + count) capacity += capacity / 2;
+			
+			xpath_node* storage = static_cast<xpath_node*>(get_memory_allocation_function()(capacity * sizeof(xpath_node)));
+			if (!storage) return; // $$ out of memory
+
+			pstd::copy(_begin, _end, storage);
+			// memcpy(storage, _begin, size * sizeof(xpath_node));
+			
+			if (_begin != &_storage) get_memory_deallocation_function()(_begin);
+			
+			_begin = storage;
+			_end = storage + size;
+			_eos = storage + capacity;
+		}
+		
+		pstd::copy(begin, end, _end);
+		// memcpy(_end, begin, count * sizeof(xpath_node));
+		_end += count;
+	}
+
+	void xpath_node_set::truncate(iterator it)
+	{
+		_end = it;
+	}
+
+	xpath_node xpath_node_set::first() const
+	{
+		if (empty()) return xpath_node();
+
+		switch (_type)
+		{
+		case type_sorted: return *_begin;
+		case type_sorted_reverse: return *(_end - 1);
+		case type_unsorted: return *pstd::min_element(_begin, _end, document_order_comparator());
+		default: return xpath_node();
+		}
+	}
+
+	void xpath_node_set::remove_duplicates()
+	{
+		if (_type == type_unsorted)
+		{
+			pstd::sort(_begin, _end, duplicate_comparator());
+		}
+		
+		truncate(pstd::unique(_begin, _end));
+	}
+
+	struct xpath_context
+	{
+		xpath_node n;
+		size_t position, size;
+
+		xpath_context(const xpath_node& n, size_t position, size_t size): n(n), position(position), size(size)
+		{
+		}
+	};
+
+	enum lexeme_t
+	{
+		lex_none = 0,
+		lex_equal,
+		lex_not_equal,
+		lex_less,
+		lex_greater,
+		lex_less_or_equal,
+		lex_greater_or_equal,
+		lex_plus,
+		lex_minus,
+		lex_multiply,
+		lex_union,
+		lex_var_ref,
+		lex_open_brace,
+		lex_close_brace,
+		lex_quoted_string,
+		lex_number,
+		lex_slash,
+		lex_double_slash,
+		lex_open_square_brace,
+		lex_close_square_brace,
+		lex_string,
+		lex_comma,
+		lex_axis_attribute,
+		lex_dot,
+		lex_double_dot,
+		lex_double_colon,
+		lex_eof
+	};
+
+	struct xpath_lexer_string
+	{
+		const char_t* begin;
+		const char_t* end;
+
+		xpath_lexer_string(): begin(0), end(0)
+		{
+		}
+
+		bool operator==(const char_t* other) const
+		{
+			size_t length = static_cast<size_t>(end - begin);
+
+			return impl::strequalrange(other, begin, length);
+		}
+	};
+
+	class xpath_lexer
+	{
+		const char_t* _cur;
+		const char_t* _cur_lexeme_pos;
+		xpath_lexer_string _cur_lexeme_contents;
+
+		lexeme_t _cur_lexeme;
+
+	public:
+		explicit xpath_lexer(const char_t* query): _cur(query)
+		{
+			next();
+		}
+		
+		const char_t* state() const
+		{
+			return _cur;
+		}
+		
+		void next()
+		{
+			const char_t* cur = _cur;
+
+			while (IS_CHARTYPEX(*cur, ctx_space)) ++cur;
+
+			// save lexeme position for error reporting
+			_cur_lexeme_pos = cur;
+
+			switch (*cur)
+			{
+			case 0:
+				_cur_lexeme = lex_eof;
+				break;
+			
+			case '>':
+				if (*(cur+1) == '=')
+				{
+					cur += 2;
+					_cur_lexeme = lex_greater_or_equal;
+				}
+				else
+				{
+					cur += 1;
+					_cur_lexeme = lex_greater;
+				}
+				break;
+
+			case '<':
+				if (*(cur+1) == '=')
+				{
+					cur += 2;
+					_cur_lexeme = lex_less_or_equal;
+				}
+				else
+				{
+					cur += 1;
+					_cur_lexeme = lex_less;
+				}
+				break;
+
+			case '!':
+				if (*(cur+1) == '=')
+				{
+					cur += 2;
+					_cur_lexeme = lex_not_equal;
+				}
+				else
+				{
+					_cur_lexeme = lex_none;
+				}
+				break;
+
+			case '=':
+				cur += 1;
+				_cur_lexeme = lex_equal;
+
+				break;
+			
+			case '+':
+				cur += 1;
+				_cur_lexeme = lex_plus;
+
+				break;
+
+			case '-':
+				cur += 1;
+				_cur_lexeme = lex_minus;
+
+				break;
+
+			case '*':
+				cur += 1;
+				_cur_lexeme = lex_multiply;
+
+				break;
+
+			case '|':
+				cur += 1;
+				_cur_lexeme = lex_union;
+
+				break;
+
+			case '$':
+				cur += 1;
+				_cur_lexeme = lex_var_ref;
+
+				break;
+			
+			case '(':
+				cur += 1;
+				_cur_lexeme = lex_open_brace;
+
+				break;
+
+			case ')':
+				cur += 1;
+				_cur_lexeme = lex_close_brace;
+
+				break;
+			
+			case '[':
+				cur += 1;
+				_cur_lexeme = lex_open_square_brace;
+
+				break;
+
+			case ']':
+				cur += 1;
+				_cur_lexeme = lex_close_square_brace;
+
+				break;
+
+			case ',':
+				cur += 1;
+				_cur_lexeme = lex_comma;
+
+				break;
+
+			case '/':
+				if (*(cur+1) == '/')
+				{
+					cur += 2;
+					_cur_lexeme = lex_double_slash;
+				}
+				else
+				{
+					cur += 1;
+					_cur_lexeme = lex_slash;
+				}
+				break;
+		
+			case '.':
+				if (*(cur+1) == '.')
+				{
+					cur += 2;
+					_cur_lexeme = lex_double_dot;
+				}
+				else if (IS_CHARTYPEX(*(cur+1), ctx_digit))
+				{
+					_cur_lexeme_contents.begin = cur; // .
+
+					++cur;
+
+					while (IS_CHARTYPEX(*cur, ctx_digit)) cur++;
+
+					_cur_lexeme_contents.end = cur;
+					
+					_cur_lexeme = lex_number;
+				}
+				else
+				{
+					cur += 1;
+					_cur_lexeme = lex_dot;
+				}
+				break;
+
+			case '@':
+				cur += 1;
+				_cur_lexeme = lex_axis_attribute;
+
+				break;
+
+			case '"':
+			case '\'':
+			{
+				char_t terminator = *cur;
+
+				++cur;
+
+				_cur_lexeme_contents.begin = cur;
+				while (*cur && *cur != terminator) cur++;
+				_cur_lexeme_contents.end = cur;
+				
+				if (!*cur)
+					_cur_lexeme = lex_none;
+				else
+				{
+					cur += 1;
+					_cur_lexeme = lex_quoted_string;
+				}
+
+				break;
+			}
+
+			case ':':
+				if (*(cur+1) == ':')
+				{
+					cur += 2;
+					_cur_lexeme = lex_double_colon;
+				}
+				else
+				{
+					_cur_lexeme = lex_none;
+				}
+				break;
+
+			default:
+				if (IS_CHARTYPEX(*cur, ctx_digit))
+				{
+					_cur_lexeme_contents.begin = cur;
+
+					while (IS_CHARTYPEX(*cur, ctx_digit)) cur++;
+				
+					if (*cur == '.')
+					{
+						cur++;
+
+						while (IS_CHARTYPEX(*cur, ctx_digit)) cur++;
+					}
+
+					_cur_lexeme_contents.end = cur;
+
+					_cur_lexeme = lex_number;
+				}
+				else if (IS_CHARTYPEX(*cur, ctx_start_symbol))
+				{
+					_cur_lexeme_contents.begin = cur;
+
+					while (IS_CHARTYPEX(*cur, ctx_symbol)) cur++;
+
+					if (cur[0] == ':')
+					{
+						if (cur[1] == '*') // namespace test ncname:*
+						{
+							cur += 2; // :*
+						}
+						else if (IS_CHARTYPEX(cur[1], ctx_symbol)) // namespace test qname
+						{
+							cur++; // :
+
+							while (IS_CHARTYPEX(*cur, ctx_symbol)) cur++;
+						}
+					}
+
+					_cur_lexeme_contents.end = cur;
+				
+					_cur_lexeme = lex_string;
+				}
+				else
+				{
+					_cur_lexeme = lex_none;
+				}
+			}
+
+			_cur = cur;
+		}
+
+		lexeme_t current() const
+		{
+			return _cur_lexeme;
+		}
+
+		const char_t* current_pos() const
+		{
+			return _cur_lexeme_pos;
+		}
+
+		const xpath_lexer_string& contents() const
+		{
+			assert(_cur_lexeme == lex_number || _cur_lexeme == lex_string || _cur_lexeme == lex_quoted_string);
+
+			return _cur_lexeme_contents;
+		}
+	};
+
+	enum ast_type_t
+	{
+		ast_op_or,						// left or right
+		ast_op_and,						// left and right
+		ast_op_equal,					// left = right
+		ast_op_not_equal, 				// left != right
+		ast_op_less,					// left < right
+		ast_op_greater,					// left > right
+		ast_op_less_or_equal,			// left <= right
+		ast_op_greater_or_equal,		// left >= right
+		ast_op_add,						// left + right
+		ast_op_subtract,				// left - right
+		ast_op_multiply,				// left * right
+		ast_op_divide,					// left / right
+		ast_op_mod,						// left % right
+		ast_op_negate,					// left - right
+		ast_op_union,					// left | right
+		ast_predicate,					// apply predicate to set; next points to next predicate
+		ast_filter,						// select * from left where right
+		ast_filter_posinv,				// select * from left where right; proximity position invariant
+		ast_string_constant,			// string constant
+		ast_number_constant,			// number constant
+		ast_func_last,					// last()
+		ast_func_position,				// position()
+		ast_func_count,					// count(left)
+		ast_func_id,					// id(left)
+		ast_func_local_name_0,			// local-name()
+		ast_func_local_name_1,			// local-name(left)
+		ast_func_namespace_uri_0,		// namespace-uri()
+		ast_func_namespace_uri_1,		// namespace-uri(left)
+		ast_func_name_0,				// name()
+		ast_func_name_1,				// name(left)
+		ast_func_string_0,				// string()
+		ast_func_string_1,				// string(left)
+		ast_func_concat,				// concat(left, right, siblings)
+		ast_func_starts_with,			// starts_with(left, right)
+		ast_func_contains,				// contains(left, right)
+		ast_func_substring_before,		// substring-before(left, right)
+		ast_func_substring_after,		// substring-after(left, right)
+		ast_func_substring_2,			// substring(left, right)
+		ast_func_substring_3,			// substring(left, right, third)
+		ast_func_string_length_0,		// string-length()
+		ast_func_string_length_1,		// string-length(left)
+		ast_func_normalize_space_0,		// normalize-space()
+		ast_func_normalize_space_1,		// normalize-space(left)
+		ast_func_translate,				// translate(left, right, third)
+		ast_func_boolean,				// boolean(left)
+		ast_func_not,					// not(left)
+		ast_func_true,					// true()
+		ast_func_false,					// false()
+		ast_func_lang,					// lang(left)
+		ast_func_number_0,				// number()
+		ast_func_number_1,				// number(left)
+		ast_func_sum,					// sum(left)
+		ast_func_floor,					// floor(left)
+		ast_func_ceiling,				// ceiling(left)
+		ast_func_round,					// round(left)
+		ast_step,						// process set left with step
+		ast_step_root					// select root node
+	};
+
+	enum axis_t
+	{
+		axis_ancestor,
+		axis_ancestor_or_self,
+		axis_attribute,
+		axis_child,
+		axis_descendant,
+		axis_descendant_or_self,
+		axis_following,
+		axis_following_sibling,
+		axis_namespace,
+		axis_parent,
+		axis_preceding,
+		axis_preceding_sibling,
+		axis_self
+	};
+	
+	enum nodetest_t
+	{
+		nodetest_none,
+		nodetest_name,
+		nodetest_type_node,
+		nodetest_type_comment,
+		nodetest_type_pi,
+		nodetest_type_text,
+		nodetest_pi,
+		nodetest_all,
+		nodetest_all_in_namespace
+	};
+
+	template <axis_t N> struct axis_to_type
+	{
+		static const axis_t axis;
+	};
+
+	template <axis_t N> const axis_t axis_to_type<N>::axis = N;
+		
+	class xpath_ast_node
+	{
+	private:
+		// node type
+		char _type;
+		char _rettype;
+
+		// for ast_step / ast_predicate
+		char _axis;
+		char _test;
+
+		// tree node structure
+		xpath_ast_node* _left;
+		xpath_ast_node* _right;
+		xpath_ast_node* _next;
+
+		union
+		{
+			// value for ast_string_constant
+			const char_t* string;
+			// value for ast_number_constant
+			double number;
+			// node test for ast_step (node name/namespace/node type/pi target)
+			const char_t* nodetest;
+		} _data;
+
+		xpath_ast_node(const xpath_ast_node&);
+		xpath_ast_node& operator=(const xpath_ast_node&);
+
+		template <class Comp> static bool compare_eq(xpath_ast_node* lhs, xpath_ast_node* rhs, const xpath_context& c, const Comp& comp)
+		{
+			xpath_value_type lt = lhs->rettype(), rt = rhs->rettype();
+
+			if (lt != xpath_type_node_set && rt != xpath_type_node_set)
+			{
+				if (lt == xpath_type_boolean || rt == xpath_type_boolean)
+					return comp(lhs->eval_boolean(c), rhs->eval_boolean(c));
+				else if (lt == xpath_type_number || rt == xpath_type_number)
+					return comp(lhs->eval_number(c), rhs->eval_number(c));
+				else if (lt == xpath_type_string || rt == xpath_type_string)
+					return comp(lhs->eval_string(c), rhs->eval_string(c));
+			}
+			else if (lt == xpath_type_node_set && rt == xpath_type_node_set)
+			{
+				xpath_node_set ls = lhs->eval_node_set(c);
+				xpath_node_set rs = rhs->eval_node_set(c);
+
+				for (xpath_node_set::const_iterator li = ls.begin(); li != ls.end(); ++li)
+					for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri)
+					{
+						if (comp(string_value(*li), string_value(*ri)))
+							return true;
+					}
+
+				return false;
+			}
+			else
+			{
+				if (lt == xpath_type_node_set)
+				{
+					pstd::swap(lhs, rhs);
+					pstd::swap(lt, rt);
+				}
+
+				if (lt == xpath_type_boolean)
+					return comp(lhs->eval_boolean(c), rhs->eval_boolean(c));
+				else if (lt == xpath_type_number)
+				{
+					double l = lhs->eval_number(c);
+					xpath_node_set rs = rhs->eval_node_set(c);
+
+					for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri)
+					{
+						if (comp(l, convert_string_to_number(string_value(*ri).c_str())))
+							return true;
+					}
+
+					return false;
+				}
+				else if (lt == xpath_type_string)
+				{
+					xpath_string l = lhs->eval_string(c);
+					xpath_node_set rs = rhs->eval_node_set(c);
+
+					for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri)
+					{
+						if (comp(l, string_value(*ri)))
+							return true;
+					}
+
+					return false;
+				}
+			}
+
+			assert(!"Wrong types");
+			return false;
+		}
+
+		template <class Comp> static bool compare_rel(xpath_ast_node* lhs, xpath_ast_node* rhs, const xpath_context& c, const Comp& comp)
+		{
+			xpath_value_type lt = lhs->rettype(), rt = rhs->rettype();
+
+			if (lt != xpath_type_node_set && rt != xpath_type_node_set)
+				return comp(lhs->eval_number(c), rhs->eval_number(c));
+			else if (lt == xpath_type_node_set && rt == xpath_type_node_set)
+			{
+				xpath_node_set ls = lhs->eval_node_set(c);
+				xpath_node_set rs = rhs->eval_node_set(c);
+
+				for (xpath_node_set::const_iterator li = ls.begin(); li != ls.end(); ++li)
+				{
+					double l = convert_string_to_number(string_value(*li).c_str());
+
+					for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri)
+					{
+						if (comp(l, convert_string_to_number(string_value(*ri).c_str())))
+							return true;
+					}
+				}
+
+				return false;
+			}
+			else if (lt != xpath_type_node_set && rt == xpath_type_node_set)
+			{
+				double l = lhs->eval_number(c);
+				xpath_node_set rs = rhs->eval_node_set(c);
+
+				for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri)
+				{
+					if (comp(l, convert_string_to_number(string_value(*ri).c_str())))
+						return true;
+				}
+
+				return false;
+			}
+			else if (lt == xpath_type_node_set && rt != xpath_type_node_set)
+			{
+				xpath_node_set ls = lhs->eval_node_set(c);
+				double r = rhs->eval_number(c);
+
+				for (xpath_node_set::const_iterator li = ls.begin(); li != ls.end(); ++li)
+				{
+					if (comp(convert_string_to_number(string_value(*li).c_str()), r))
+						return true;
+				}
+
+				return false;
+			}
+			else
+			{
+				assert(!"Wrong types");
+				return false;
+			}
+		}
+
+		void apply_predicate(xpath_node_set& ns, size_t first, xpath_ast_node* expr)
+		{
+			assert(ns.size() >= first);
+
+			size_t i = 1;
+			size_t size = ns.size() - first;
+				
+			xpath_node_set::iterator last = ns.mut_begin() + first;
+				
+			// remove_if... or well, sort of
+			for (xpath_node_set::iterator it = last; it != ns.end(); ++it, ++i)
+			{
+				xpath_context c(*it, i, size);
+			
+				if (expr->rettype() == xpath_type_number)
+				{
+					if (expr->eval_number(c) == i)
+						*last++ = *it;
+				}
+				else if (expr->eval_boolean(c))
+					*last++ = *it;
+			}
+			
+			ns.truncate(last);
+		}
+
+		void apply_predicates(xpath_node_set& ns, size_t first)
+		{
+			if (ns.size() == first) return;
+			
+			for (xpath_ast_node* pred = _right; pred; pred = pred->_next)
+			{
+				apply_predicate(ns, first, pred->_left);
+			}
+		}
+
+		void step_push(xpath_node_set& ns, const xml_attribute& a, const xml_node& parent)
+		{
+			if (!a) return;
+
+			const char_t* name = a.name();
+
+			// There are no attribute nodes corresponding to attributes that declare namespaces
+			// That is, "xmlns:..." or "xmlns"
+			if (starts_with(name, PUGIXML_TEXT("xmlns")) && (name[5] == 0 || name[5] == ':')) return;
+			
+			switch (_test)
+			{
+			case nodetest_name:
+				if (impl::strequal(name, _data.nodetest)) ns.push_back(xpath_node(a, parent));
+				break;
+				
+			case nodetest_type_node:
+			case nodetest_all:
+				ns.push_back(xpath_node(a, parent));
+				break;
+				
+			case nodetest_all_in_namespace:
+				if (starts_with(name, _data.nodetest))
+					ns.push_back(xpath_node(a, parent));
+				break;
+			
+			default:
+				;
+			}
+		}
+		
+		void step_push(xpath_node_set& ns, const xml_node& n)
+		{
+			if (!n) return;
+
+			switch (_test)
+			{
+			case nodetest_name:
+				if (n.type() == node_element && impl::strequal(n.name(), _data.nodetest)) ns.push_back(n);
+				break;
+				
+			case nodetest_type_node:
+				ns.push_back(n);
+				break;
+				
+			case nodetest_type_comment:
+				if (n.type() == node_comment)
+					ns.push_back(n);
+				break;
+				
+			case nodetest_type_text:
+				if (n.type() == node_pcdata || n.type() == node_cdata)
+					ns.push_back(n);
+				break;
+				
+			case nodetest_type_pi:
+				if (n.type() == node_pi)
+					ns.push_back(n);
+				break;
+									
+			case nodetest_pi:
+				if (n.type() == node_pi && impl::strequal(n.name(), _data.nodetest))
+					ns.push_back(n);
+				break;
+				
+			case nodetest_all:
+				if (n.type() == node_element)
+					ns.push_back(n);
+				break;
+				
+			case nodetest_all_in_namespace:
+				if (n.type() == node_element && starts_with(n.name(), _data.nodetest))
+					ns.push_back(n);
+				break;
+
+			default:
+				assert(!"Unknown axis");
+			} 
+		}
+
+		template <class T> void step_fill(xpath_node_set& ns, const xml_node& n, T)
+		{
+			const axis_t axis = T::axis;
+
+			switch (axis)
+			{
+			case axis_attribute:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
+				
+				for (xml_attribute a = n.first_attribute(); a; a = a.next_attribute())
+					step_push(ns, a, n);
+				
+				break;
+			}
+			
+			case axis_child:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
+
+				for (xml_node c = n.first_child(); c; c = c.next_sibling())
+					step_push(ns, c);
+					
+				break;
+			}
+			
+			case axis_descendant:
+			case axis_descendant_or_self:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
+				
+				if (axis == axis_descendant_or_self)
+					step_push(ns, n);
+					
+				xml_node cur = n.first_child();
+				
+				while (cur && cur != n)
+				{
+					step_push(ns, cur);
+					
+					if (cur.first_child())
+						cur = cur.first_child();
+					else if (cur.next_sibling())
+						cur = cur.next_sibling();
+					else
+					{
+						while (!cur.next_sibling() && cur != n)
+							cur = cur.parent();
+					
+						if (cur != n) cur = cur.next_sibling();
+					}
+				}
+				
+				break;
+			}
+			
+			case axis_following_sibling:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
+
+				for (xml_node c = n.next_sibling(); c; c = c.next_sibling())
+					step_push(ns, c);
+				
+				break;
+			}
+			
+			case axis_preceding_sibling:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted;
+
+				for (xml_node c = n.previous_sibling(); c; c = c.previous_sibling())
+					step_push(ns, c);
+				
+				break;
+			}
+			
+			case axis_following:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
+
+				xml_node cur = n;
+
+				// exit from this node so that we don't include descendants
+				while (cur && !cur.next_sibling()) cur = cur.parent();
+				cur = cur.next_sibling();
+
+				for (;;)
+				{
+					step_push(ns, cur);
+
+					if (cur.first_child())
+						cur = cur.first_child();
+					else if (cur.next_sibling())
+						cur = cur.next_sibling();
+					else
+					{
+						while (cur && !cur.next_sibling()) cur = cur.parent();
+						cur = cur.next_sibling();
+
+						if (!cur) break;
+					}
+				}
+
+				break;
+			}
+
+			case axis_preceding:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted;
+
+				xml_node cur = n;
+
+				while (cur && !cur.previous_sibling()) cur = cur.parent();
+				cur = cur.previous_sibling();
+
+				for (;;)
+				{
+					if (cur.last_child())
+						cur = cur.last_child();
+					else
+					{
+						// leaf node, can't be ancestor
+						step_push(ns, cur);
+
+						if (cur.previous_sibling())
+							cur = cur.previous_sibling();
+						else
+						{
+							do 
+							{
+								cur = cur.parent();
+								if (!cur) break;
+
+								if (!node_is_ancestor(cur, n)) step_push(ns, cur);
+							}
+							while (!cur.previous_sibling());
+
+							cur = cur.previous_sibling();
+
+							if (!cur) break;
+						}
+					}
+				}
+
+				break;
+			}
+			
+			case axis_ancestor:
+			case axis_ancestor_or_self:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted;
+
+				if (axis == axis_ancestor_or_self)
+					step_push(ns, n);
+
+				xml_node cur = n.parent();
+				
+				while (cur)
+				{
+					step_push(ns, cur);
+					
+					cur = cur.parent();
+				}
+				
+				break;
+			}
+
+			case axis_self:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
+
+				step_push(ns, n);
+
+				break;
+			}
+
+			case axis_parent:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
+
+				if (n.parent()) step_push(ns, n.parent());
+
+				break;
+			}
+				
+			default:
+				assert(!"Unimplemented axis");
+			}
+		}
+		
+		template <class T> void step_fill(xpath_node_set& ns, const xml_attribute& a, const xml_node& p, T v)
+		{
+			const axis_t axis = T::axis;
+
+			switch (axis)
+			{
+			case axis_ancestor:
+			case axis_ancestor_or_self:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted;
+
+				if (axis == axis_ancestor_or_self && _test == nodetest_type_node) // reject attributes based on principal node type test
+					step_push(ns, a, p);
+
+				xml_node cur = p;
+				
+				while (cur)
+				{
+					step_push(ns, cur);
+					
+					cur = cur.parent();
+				}
+				
+				break;
+			}
+
+			case axis_descendant_or_self:
+			case axis_self:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
+
+				if (_test == nodetest_type_node) // reject attributes based on principal node type test
+					step_push(ns, a, p);
+
+				break;
+			}
+
+			case axis_following:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
+				
+				xml_node cur = p;
+				
+				for (;;)
+				{
+					if (cur.first_child())
+						cur = cur.first_child();
+					else if (cur.next_sibling())
+						cur = cur.next_sibling();
+					else
+					{
+						while (cur && !cur.next_sibling()) cur = cur.parent();
+						cur = cur.next_sibling();
+						
+						if (!cur) break;
+					}
+
+					step_push(ns, cur);
+				}
+
+				break;
+			}
+
+			case axis_parent:
+			{
+				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
+
+				step_push(ns, p);
+
+				break;
+			}
+
+			case axis_preceding:
+			{
+				// preceding:: axis does not include attribute nodes and attribute ancestors (they are the same as parent's ancestors), so we can reuse node preceding
+				step_fill(ns, p, v);
+				break;
+			}
+			
+			default:
+				assert(!"Unimplemented axis");
+			}
+		}
+		
+		template <class T> void step_do(xpath_node_set& ns, const xpath_context& c, T v)
+		{
+			const axis_t axis = T::axis;
+
+			assert(ns.empty());
+
+			switch (axis)
+			{
+			case axis_ancestor:
+			case axis_ancestor_or_self:
+			case axis_descendant_or_self:
+			case axis_following:
+			case axis_parent:
+			case axis_preceding:
+			case axis_self:
+				if (_left)
+				{
+					xpath_node_set s = _left->eval_node_set(c);
+							
+					for (xpath_node_set::const_iterator it = s.begin(); it != s.end(); ++it)
+					{
+						size_t size = ns.size();
+						
+						if (it->node())
+							step_fill(ns, it->node(), v);
+						else
+							step_fill(ns, it->attribute(), it->parent(), v);
+							
+						apply_predicates(ns, size);
+					}
+				}
+				else
+				{
+					if (c.n.node()) step_fill(ns, c.n.node(), v);
+					else step_fill(ns, c.n.attribute(), c.n.parent(), v);
+					
+					apply_predicates(ns, 0);
+				}
+				
+				break;
+		
+			case axis_following_sibling:
+			case axis_preceding_sibling:
+			case axis_attribute:
+			case axis_child:
+			case axis_descendant:
+				if (_left)
+				{
+					xpath_node_set s = _left->eval_node_set(c);
+					
+					for (xpath_node_set::const_iterator it = s.begin(); it != s.end(); ++it)
+					{
+						size_t size = ns.size();
+						
+						if (it->node())
+							step_fill(ns, it->node(), v);
+						
+						apply_predicates(ns, size);
+					}
+				}
+				else if (c.n.node())
+				{
+					step_fill(ns, c.n.node(), v);
+					
+					apply_predicates(ns, 0);
+				}
+				
+				break;
+			
+			case axis_namespace:
+				break;
+				
+			default:
+				assert(!"Unimplemented axis");
+			}
+		}
+		
+	public:
+		xpath_ast_node(ast_type_t type, xpath_value_type rettype, const char_t* value):
+			_type((char)type), _rettype((char)rettype), _axis(0), _test(0), _left(0), _right(0), _next(0)
+		{
+			assert(type == ast_string_constant);
+			_data.string = value;
+		}
+
+		xpath_ast_node(ast_type_t type, xpath_value_type rettype, double value):
+			_type((char)type), _rettype((char)rettype), _axis(0), _test(0), _left(0), _right(0), _next(0)
+		{
+			assert(type == ast_number_constant);
+			_data.number = value;
+		}
+		
+		xpath_ast_node(ast_type_t type, xpath_value_type rettype, xpath_ast_node* left = 0, xpath_ast_node* right = 0):
+			_type((char)type), _rettype((char)rettype), _axis(0), _test(0), _left(left), _right(right), _next(0)
+		{
+		}
+
+		xpath_ast_node(ast_type_t type, xpath_ast_node* left, axis_t axis, nodetest_t test, const char_t* contents):
+			_type((char)type), _rettype(xpath_type_node_set), _axis((char)axis), _test((char)test), _left(left), _right(0), _next(0)
+		{
+			_data.nodetest = contents;
+		}
+
+		void set_next(xpath_ast_node* value)
+		{
+			_next = value;
+		}
+
+		void set_right(xpath_ast_node* value)
+		{
+			_right = value;
+		}
+
+		bool eval_boolean(const xpath_context& c)
+		{
+			switch (_type)
+			{
+			case ast_op_or:
+				if (_left->eval_boolean(c)) return true;
+				else return _right->eval_boolean(c);
+				
+			case ast_op_and:
+				if (!_left->eval_boolean(c)) return false;
+				else return _right->eval_boolean(c);
+				
+			case ast_op_equal:
+				return compare_eq(_left, _right, c, pstd::equal_to());
+
+			case ast_op_not_equal:
+				return compare_eq(_left, _right, c, pstd::not_equal_to());
+	
+			case ast_op_less:
+				return compare_rel(_left, _right, c, pstd::less());
+			
+			case ast_op_greater:
+				return compare_rel(_right, _left, c, pstd::less());
+
+			case ast_op_less_or_equal:
+				return compare_rel(_left, _right, c, pstd::less_equal());
+			
+			case ast_op_greater_or_equal:
+				return compare_rel(_right, _left, c, pstd::less_equal());
+
+			case ast_func_starts_with:
+				return starts_with(_left->eval_string(c).c_str(), _right->eval_string(c).c_str());
+
+			case ast_func_contains:
+			{
+				xpath_string lr = _left->eval_string(c);
+				xpath_string rr = _right->eval_string(c);
+
+				return find_substring(lr.c_str(), rr.c_str()) != 0;
+			}
+
+			case ast_func_boolean:
+				return _left->eval_boolean(c);
+				
+			case ast_func_not:
+				return !_left->eval_boolean(c);
+				
+			case ast_func_true:
+				return true;
+				
+			case ast_func_false:
+				return false;
+
+			case ast_func_lang:
+			{
+				if (c.n.attribute()) return false;
+				
+				xpath_string lang = _left->eval_string(c);
+				
+				for (xml_node n = c.n.node(); n; n = n.parent())
+				{
+					xml_attribute a = n.attribute(PUGIXML_TEXT("xml:lang"));
+					
+					if (a)
+					{
+						const char_t* value = a.value();
+						
+						// strnicmp / strncasecmp is not portable
+						for (const char_t* lit = lang.c_str(); *lit; ++lit)
+						{
+							if (tolower(*lit) != tolower(*value)) return false;
+							++value;
+						}
+						
+						return *value == 0 || *value == '-';
+					}
+				}
+				
+				return false;
+			}
+
+			default:
+			{
+				switch (_rettype)
+				{
+				case xpath_type_number:
+					return convert_number_to_boolean(eval_number(c));
+					
+				case xpath_type_string:
+					return !eval_string(c).empty();
+					
+				case xpath_type_node_set:				
+					return !eval_node_set(c).empty();
+					
+				default:
+					assert(!"Wrong expression for return type boolean");
+					return false;
+				}
+			}
+			}
+		}
+
+		double eval_number(const xpath_context& c)
+		{
+			switch (_type)
+			{
+			case ast_op_add:
+				return _left->eval_number(c) + _right->eval_number(c);
+				
+			case ast_op_subtract:
+				return _left->eval_number(c) - _right->eval_number(c);
+
+			case ast_op_multiply:
+				return _left->eval_number(c) * _right->eval_number(c);
+
+			case ast_op_divide:
+				return _left->eval_number(c) / _right->eval_number(c);
+
+			case ast_op_mod:
+				return fmod(_left->eval_number(c), _right->eval_number(c));
+
+			case ast_op_negate:
+				return -_left->eval_number(c);
+
+			case ast_number_constant:
+				return _data.number;
+
+			case ast_func_last:
+				return (double)c.size;
+			
+			case ast_func_position:
+				return (double)c.position;
+
+			case ast_func_count:
+				return (double)_left->eval_node_set(c).size();
+			
+			case ast_func_string_length_0:
+				return (double)string_value(c.n).length();
+			
+			case ast_func_string_length_1:
+				return (double)_left->eval_string(c).length();
+			
+			case ast_func_number_0:
+				return convert_string_to_number(string_value(c.n).c_str());
+			
+			case ast_func_number_1:
+				return _left->eval_number(c);
+
+			case ast_func_sum:
+			{
+				double r = 0;
+				
+				xpath_node_set ns = _left->eval_node_set(c);
+				
+				for (xpath_node_set::const_iterator it = ns.begin(); it != ns.end(); ++it)
+					r += convert_string_to_number(string_value(*it).c_str());
+			
+				return r;
+			}
+
+			case ast_func_floor:
+			{
+				double r = _left->eval_number(c);
+				
+				return r == r ? floor(r) : r;
+			}
+
+			case ast_func_ceiling:
+			{
+				double r = _left->eval_number(c);
+				
+				return r == r ? ceil(r) : r;
+			}
+
+			case ast_func_round:
+				return round_nearest_nzero(_left->eval_number(c));
+			
+			default:
+			{
+				switch (_rettype)
+				{
+				case xpath_type_boolean:
+					return eval_boolean(c) ? 1 : 0;
+					
+				case xpath_type_string:
+					return convert_string_to_number(eval_string(c).c_str());
+					
+				case xpath_type_node_set:
+					return convert_string_to_number(eval_string(c).c_str());
+					
+				default:
+					assert(!"Wrong expression for return type number");
+					return 0;
+				}
+				
+			}
+			}
+		}
+		
+		xpath_string eval_string(const xpath_context& c)
+		{
+			switch (_type)
+			{
+			case ast_string_constant:
+				return xpath_string_const(_data.string);
+			
+			case ast_func_local_name_0:
+			{
+				xpath_node na = c.n;
+				
+				return xpath_string_const(local_name(na));
+			}
+
+			case ast_func_local_name_1:
+			{
+				xpath_node_set ns = _left->eval_node_set(c);
+				xpath_node na = ns.first();
+				
+				return xpath_string_const(local_name(na));
+			}
+
+			case ast_func_name_0:
+			{
+				xpath_node na = c.n;
+				
+				return xpath_string_const(qualified_name(na));
+			}
+
+			case ast_func_name_1:
+			{
+				xpath_node_set ns = _left->eval_node_set(c);
+				xpath_node na = ns.first();
+				
+				return xpath_string_const(qualified_name(na));
+			}
+
+			case ast_func_namespace_uri_0:
+			{
+				xpath_node na = c.n;
+				
+				return xpath_string_const(namespace_uri(na));
+			}
+
+			case ast_func_namespace_uri_1:
+			{
+				xpath_node_set ns = _left->eval_node_set(c);
+				xpath_node na = ns.first();
+				
+				return xpath_string_const(namespace_uri(na));
+			}
+
+			case ast_func_string_0:
+				return string_value(c.n);
+
+			case ast_func_string_1:
+				return _left->eval_string(c);
+
+			case ast_func_concat:
+			{
+				xpath_string r = _left->eval_string(c);
+				
+				for (xpath_ast_node* n = _right; n; n = n->_next)
+					r.append(n->eval_string(c));
+			
+				return r;
+			}
+
+			case ast_func_substring_before:
+			{
+				xpath_string s = _left->eval_string(c);
+				xpath_string p = _right->eval_string(c);
+
+				const char_t* pos = find_substring(s.c_str(), p.c_str());
+				
+				return pos ? xpath_string(s.c_str(), pos) : xpath_string();
+			}
+			
+			case ast_func_substring_after:
+			{
+				xpath_string s = _left->eval_string(c);
+				xpath_string p = _right->eval_string(c);
+				
+				const char_t* pos = find_substring(s.c_str(), p.c_str());
+				
+				return pos ? xpath_string(pos + p.length()) : xpath_string();
+			}
+
+			case ast_func_substring_2:
+			{
+				xpath_string s = _left->eval_string(c);
+				double first = round_nearest(_right->eval_number(c));
+				
+				if (is_nan(first)) return xpath_string(); // NaN
+				else if (first >= s.length() + 1) return xpath_string();
+				
+				size_t pos = first < 1 ? 1 : (size_t)first;
+				
+				return xpath_string(s.c_str() + (pos - 1));
+			}
+			
+			case ast_func_substring_3:
+			{
+				xpath_string s = _left->eval_string(c);
+				size_t s_length = s.length();
+
+				double first = round_nearest(_right->eval_number(c));
+				double last = first + round_nearest(_right->_next->eval_number(c));
+				
+				if (is_nan(first) || is_nan(last)) return xpath_string();
+				else if (first >= s_length + 1) return xpath_string();
+				else if (first >= last) return xpath_string();
+				
+				size_t pos = first < 1 ? 1 : (size_t)first;
+				size_t end = last >= s_length + 1 ? s_length + 1 : (size_t)last;
+
+				size_t size_requested = end - pos;
+				size_t size_to_end = s_length - pos + 1;
+
+				size_t size = size_requested < size_to_end ? size_requested : size_to_end;
+				
+				return xpath_string(s.c_str() + pos - 1, s.c_str() + pos - 1 + size);
+			}
+
+			case ast_func_normalize_space_0:
+			{
+				xpath_string s = string_value(c.n);
+
+				normalize_space(s.data());
+
+				return s;
+			}
+
+			case ast_func_normalize_space_1:
+			{
+				xpath_string s = _left->eval_string(c);
+
+				normalize_space(s.data());
+			
+				return s;
+			}
+
+			case ast_func_translate:
+			{
+				xpath_string s = _left->eval_string(c);
+				xpath_string from = _right->eval_string(c);
+				xpath_string to = _right->_next->eval_string(c);
+
+				translate(s.data(), from.c_str(), to.c_str());
+
+				return s;
+			}
+
+			default:
+			{
+				switch (_rettype)
+				{
+				case xpath_type_boolean:
+					return xpath_string_const(eval_boolean(c) ? PUGIXML_TEXT("true") : PUGIXML_TEXT("false"));
+					
+				case xpath_type_number:
+					return convert_number_to_string(eval_number(c));
+					
+				case xpath_type_node_set:
+				{
+					xpath_node_set ns = eval_node_set(c);
+					return ns.empty() ? xpath_string() : string_value(ns.first());
+				}
+				
+				default:
+					assert(!"Wrong expression for return type string");
+					return xpath_string();
+				}
+			}
+			}
+		}
+
+		xpath_node_set eval_node_set(const xpath_context& c)
+		{
+			switch (_type)
+			{
+			case ast_op_union:
+			{
+				xpath_node_set ls = _left->eval_node_set(c);
+				xpath_node_set rs = _right->eval_node_set(c);
+				
+				// we can optimize merging two sorted sets, but this is a very rare operation, so don't bother
+  		        ls._type = xpath_node_set::type_unsorted;
+
+				ls.append(rs.begin(), rs.end());
+				
+				ls.remove_duplicates();
+				
+				return ls;
+			}
+
+			case ast_filter:
+			case ast_filter_posinv:
+			{
+				xpath_node_set set = _left->eval_node_set(c);
+
+				// either expression is a number or it contains position() call; sort by document order
+				if (_type == ast_filter) set.sort();
+
+				apply_predicate(set, 0, _right);
+			
+				return set;
+			}
+			
+			case ast_func_id:
+				return xpath_node_set();
+			
+			case ast_step:
+			{
+				xpath_node_set ns;
+				
+				switch (_axis)
+				{
+				case axis_ancestor:
+					step_do(ns, c, axis_to_type<axis_ancestor>());
+					break;
+					
+				case axis_ancestor_or_self:
+					step_do(ns, c, axis_to_type<axis_ancestor_or_self>());
+					break;
+
+				case axis_attribute:
+					step_do(ns, c, axis_to_type<axis_attribute>());
+					break;
+
+				case axis_child:
+					step_do(ns, c, axis_to_type<axis_child>());
+					break;
+				
+				case axis_descendant:
+					step_do(ns, c, axis_to_type<axis_descendant>());
+					break;
+
+				case axis_descendant_or_self:
+					step_do(ns, c, axis_to_type<axis_descendant_or_self>());
+					break;
+
+				case axis_following:
+					step_do(ns, c, axis_to_type<axis_following>());
+					break;
+				
+				case axis_following_sibling:
+					step_do(ns, c, axis_to_type<axis_following_sibling>());
+					break;
+				
+				case axis_namespace:
+					step_do(ns, c, axis_to_type<axis_namespace>());
+					break;
+				
+				case axis_parent:
+					step_do(ns, c, axis_to_type<axis_parent>());
+					break;
+				
+				case axis_preceding:
+					step_do(ns, c, axis_to_type<axis_preceding>());
+					break;
+
+				case axis_preceding_sibling:
+					step_do(ns, c, axis_to_type<axis_preceding_sibling>());
+					break;
+				
+				case axis_self:
+					step_do(ns, c, axis_to_type<axis_self>());
+					break;
+				}
+				
+				ns.remove_duplicates();
+				
+				return ns;
+			}
+
+			case ast_step_root:
+			{
+				assert(!_right); // root step can't have any predicates
+
+				xpath_node_set ns;
+				ns._type = xpath_node_set::type_sorted;
+
+				if (c.n.node()) ns.push_back(c.n.node().root());
+				else if (c.n.attribute()) ns.push_back(c.n.parent().root());
+
+				return ns;
+			}
+
+			default:
+				assert(!"Wrong expression for return type node set");
+				return xpath_node_set();
+			}
+		}
+		
+		bool is_posinv()
+		{
+			switch (_type)
+			{
+			case ast_func_position:
+				return false;
+
+			case ast_string_constant:
+			case ast_number_constant:
+			// $$ case ast_variable:
+				return true;
+
+			case ast_step:
+			case ast_step_root:
+				return true;
+
+			case ast_predicate:
+			case ast_filter:
+			case ast_filter_posinv:
+				return true;
+
+			default:
+				if (_left && !_left->is_posinv()) return false;
+				
+				for (xpath_ast_node* n = _right; n; n = n->_next)
+					if (!n->is_posinv()) return false;
+					
+				return true;
+			}
+		}
+
+		xpath_value_type rettype() const
+		{
+			return static_cast<xpath_value_type>(_rettype);
+		}
+	};
+
+	struct xpath_parser
+	{
+	    xpath_allocator& _alloc;
+	    xpath_lexer _lexer;
+		const char_t* _query;
+		xpath_parse_result* _result;
+		jmp_buf _error_handler;
+
+		xpath_parser(const xpath_parser&);
+		xpath_parser& operator=(const xpath_parser&);
+
+		void throw_error(const char* message)
+		{
+			_result->error = message;
+			_result->offset = _lexer.current_pos() - _query;
+
+			longjmp(_error_handler, 1);
+		}
+
+		void* alloc_node()
+		{
+			void* result = _alloc.allocate(sizeof(xpath_ast_node));
+
+			if (!result) throw_error("Out of memory");
+
+			return result;
+		}
+
+		const char_t* alloc_string(const xpath_lexer_string& value)
+		{
+			if (value.begin)
+			{
+				size_t length = static_cast<size_t>(value.end - value.begin);
+
+				char_t* c = static_cast<char_t*>(_alloc.allocate((length + 1) * sizeof(char_t)));
+				if (!c) throw_error("Out of memory");
+
+				memcpy(c, value.begin, length * sizeof(char_t));
+				c[length] = 0;
+
+				return c;
+			}
+			else return 0;
+		}
+
+		xpath_ast_node* parse_function_helper(ast_type_t type0, ast_type_t type1, size_t argc, xpath_ast_node* args[2])
+		{
+			assert(argc <= 1);
+
+			if (argc == 1 && args[0]->rettype() != xpath_type_node_set) throw_error("Function has to be applied to node set");
+
+			return new (alloc_node()) xpath_ast_node(argc == 0 ? type0 : type1, xpath_type_string, args[0]);
+		}
+
+		xpath_ast_node* parse_function(const xpath_lexer_string& name, size_t argc, xpath_ast_node* args[2])
+		{
+			switch (name.begin[0])
+			{
+			case 'b':
+				if (name == PUGIXML_TEXT("boolean") && argc == 1)
+					return new (alloc_node()) xpath_ast_node(ast_func_boolean, xpath_type_boolean, args[0]);
+					
+				break;
+			
+			case 'c':
+				if (name == PUGIXML_TEXT("count") && argc == 1)
+				{
+					if (args[0]->rettype() != xpath_type_node_set) throw_error("count() has to be applied to node set");
+					return new (alloc_node()) xpath_ast_node(ast_func_count, xpath_type_number, args[0]);
+				}
+				else if (name == PUGIXML_TEXT("contains") && argc == 2)
+					return new (alloc_node()) xpath_ast_node(ast_func_contains, xpath_type_string, args[0], args[1]);
+				else if (name == PUGIXML_TEXT("concat") && argc >= 2)
+					return new (alloc_node()) xpath_ast_node(ast_func_concat, xpath_type_string, args[0], args[1]);
+				else if (name == PUGIXML_TEXT("ceiling") && argc == 1)
+					return new (alloc_node()) xpath_ast_node(ast_func_ceiling, xpath_type_number, args[0]);
+					
+				break;
+			
+			case 'f':
+				if (name == PUGIXML_TEXT("false") && argc == 0)
+					return new (alloc_node()) xpath_ast_node(ast_func_false, xpath_type_boolean);
+				else if (name == PUGIXML_TEXT("floor") && argc == 1)
+					return new (alloc_node()) xpath_ast_node(ast_func_floor, xpath_type_number, args[0]);
+					
+				break;
+			
+			case 'i':
+				if (name == PUGIXML_TEXT("id") && argc == 1)
+					return new (alloc_node()) xpath_ast_node(ast_func_id, xpath_type_node_set, args[0]);
+					
+				break;
+			
+			case 'l':
+				if (name == PUGIXML_TEXT("last") && argc == 0)
+					return new (alloc_node()) xpath_ast_node(ast_func_last, xpath_type_number);
+				else if (name == PUGIXML_TEXT("lang") && argc == 1)
+					return new (alloc_node()) xpath_ast_node(ast_func_lang, xpath_type_boolean, args[0]);
+				else if (name == PUGIXML_TEXT("local-name") && argc <= 1)
+					return parse_function_helper(ast_func_local_name_0, ast_func_local_name_1, argc, args);
+			
+				break;
+			
+			case 'n':
+				if (name == PUGIXML_TEXT("name") && argc <= 1)
+					return parse_function_helper(ast_func_name_0, ast_func_name_1, argc, args);
+				else if (name == PUGIXML_TEXT("namespace-uri") && argc <= 1)
+					return parse_function_helper(ast_func_namespace_uri_0, ast_func_namespace_uri_1, argc, args);
+				else if (name == PUGIXML_TEXT("normalize-space") && argc <= 1)
+					return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_normalize_space_0 : ast_func_normalize_space_1, xpath_type_string, args[0], args[1]);
+				else if (name == PUGIXML_TEXT("not") && argc == 1)
+					return new (alloc_node()) xpath_ast_node(ast_func_not, xpath_type_boolean, args[0]);
+				else if (name == PUGIXML_TEXT("number") && argc <= 1)
+					return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_number_0 : ast_func_number_1, xpath_type_number, args[0]);
+			
+				break;
+			
+			case 'p':
+				if (name == PUGIXML_TEXT("position") && argc == 0)
+					return new (alloc_node()) xpath_ast_node(ast_func_position, xpath_type_number);
+				
+				break;
+			
+			case 'r':
+				if (name == PUGIXML_TEXT("round") && argc == 1)
+					return new (alloc_node()) xpath_ast_node(ast_func_round, xpath_type_number, args[0]);
+
+				break;
+			
+			case 's':
+				if (name == PUGIXML_TEXT("string") && argc <= 1)
+					return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_string_0 : ast_func_string_1, xpath_type_string, args[0]);
+				else if (name == PUGIXML_TEXT("string-length") && argc <= 1)
+					return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_string_length_0 : ast_func_string_length_1, xpath_type_string, args[0]);
+				else if (name == PUGIXML_TEXT("starts-with") && argc == 2)
+					return new (alloc_node()) xpath_ast_node(ast_func_starts_with, xpath_type_boolean, args[0], args[1]);
+				else if (name == PUGIXML_TEXT("substring-before") && argc == 2)
+					return new (alloc_node()) xpath_ast_node(ast_func_substring_before, xpath_type_string, args[0], args[1]);
+				else if (name == PUGIXML_TEXT("substring-after") && argc == 2)
+					return new (alloc_node()) xpath_ast_node(ast_func_substring_after, xpath_type_string, args[0], args[1]);
+				else if (name == PUGIXML_TEXT("substring") && (argc == 2 || argc == 3))
+					return new (alloc_node()) xpath_ast_node(argc == 2 ? ast_func_substring_2 : ast_func_substring_3, xpath_type_string, args[0], args[1]);
+				else if (name == PUGIXML_TEXT("sum") && argc == 1)
+				{
+					if (args[0]->rettype() != xpath_type_node_set) throw_error("sum() has to be applied to node set");
+					return new (alloc_node()) xpath_ast_node(ast_func_sum, xpath_type_number, args[0]);
+				}
+
+				break;
+			
+			case 't':
+				if (name == PUGIXML_TEXT("translate") && argc == 3)
+					return new (alloc_node()) xpath_ast_node(ast_func_translate, xpath_type_string, args[0], args[1]);
+				else if (name == PUGIXML_TEXT("true") && argc == 0)
+					return new (alloc_node()) xpath_ast_node(ast_func_true, xpath_type_boolean);
+					
+				break;
+			}
+
+			throw_error("Unrecognized function or wrong parameter count");
+
+			return 0;
+		}
+
+		axis_t parse_axis_name(const xpath_lexer_string& name, bool& specified)
+		{
+			specified = true;
+
+			switch (name.begin[0])
+			{
+			case 'a':
+				if (name == PUGIXML_TEXT("ancestor"))
+					return axis_ancestor;
+				else if (name == PUGIXML_TEXT("ancestor-or-self"))
+					return axis_ancestor_or_self;
+				else if (name == PUGIXML_TEXT("attribute"))
+					return axis_attribute;
+				
+				break;
+			
+			case 'c':
+				if (name == PUGIXML_TEXT("child"))
+					return axis_child;
+				
+				break;
+			
+			case 'd':
+				if (name == PUGIXML_TEXT("descendant"))
+					return axis_descendant;
+				else if (name == PUGIXML_TEXT("descendant-or-self"))
+					return axis_descendant_or_self;
+				
+				break;
+			
+			case 'f':
+				if (name == PUGIXML_TEXT("following"))
+					return axis_following;
+				else if (name == PUGIXML_TEXT("following-sibling"))
+					return axis_following_sibling;
+				
+				break;
+			
+			case 'n':
+				if (name == PUGIXML_TEXT("namespace"))
+					return axis_namespace;
+				
+				break;
+			
+			case 'p':
+				if (name == PUGIXML_TEXT("parent"))
+					return axis_parent;
+				else if (name == PUGIXML_TEXT("preceding"))
+					return axis_preceding;
+				else if (name == PUGIXML_TEXT("preceding-sibling"))
+					return axis_preceding_sibling;
+				
+				break;
+			
+			case 's':
+				if (name == PUGIXML_TEXT("self"))
+					return axis_self;
+				
+				break;
+			}
+
+			specified = false;
+			return axis_child;
+		}
+
+		nodetest_t parse_node_test_type(const xpath_lexer_string& name)
+		{
+			switch (name.begin[0])
+			{
+			case 'c':
+				if (name == PUGIXML_TEXT("comment"))
+					return nodetest_type_comment;
+
+				break;
+
+			case 'n':
+				if (name == PUGIXML_TEXT("node"))
+					return nodetest_type_node;
+
+				break;
+
+			case 'p':
+				if (name == PUGIXML_TEXT("processing-instruction"))
+					return nodetest_type_pi;
+
+				break;
+
+			case 't':
+				if (name == PUGIXML_TEXT("text"))
+					return nodetest_type_text;
+
+				break;
+			}
+
+			return nodetest_none;
+		}
+
+	    // PrimaryExpr ::= VariableReference | '(' Expr ')' | Literal | Number | FunctionCall
+	    xpath_ast_node* parse_primary_expression()
+	    {
+	    	switch (_lexer.current())
+	    	{
+	    	case lex_var_ref:
+	    	{
+				throw_error("Variables are not supported");
+
+	    		return 0;
+			}
+
+			case lex_open_brace:
+			{
+				_lexer.next();
+
+				xpath_ast_node* n = parse_expression();
+
+				if (_lexer.current() != lex_close_brace)
+					throw_error("Unmatched braces");
+
+				_lexer.next();
+
+				return n;
+			}
+
+			case lex_quoted_string:
+			{
+				const char_t* value = alloc_string(_lexer.contents());
+
+				xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_string_constant, xpath_type_string, value);
+				_lexer.next();
+
+				return n;
+			}
+
+			case lex_number:
+			{
+				double value = 0;
+
+				if (!convert_string_to_number(_lexer.contents().begin, _lexer.contents().end, &value))
+					throw_error("Out of memory");
+
+				xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_number_constant, xpath_type_number, value);
+				_lexer.next();
+
+				return n;
+			}
+
+			case lex_string:
+			{
+				xpath_ast_node* args[2] = {0};
+				size_t argc = 0;
+				
+				xpath_lexer_string function = _lexer.contents();
+				_lexer.next();
+				
+				xpath_ast_node* last_arg = 0;
+				
+				if (_lexer.current() != lex_open_brace)
+					throw_error("Unrecognized function call");
+				_lexer.next();
+
+				if (_lexer.current() != lex_close_brace)
+					args[argc++] = parse_expression();
+
+				while (_lexer.current() != lex_close_brace)
+				{
+					if (_lexer.current() != lex_comma)
+						throw_error("No comma between function arguments");
+					_lexer.next();
+					
+					xpath_ast_node* n = parse_expression();
+					
+					if (argc < 2) args[argc] = n;
+					else last_arg->set_next(n);
+
+					argc++;
+					last_arg = n;
+				}
+				
+				_lexer.next();
+
+				return parse_function(function, argc, args);
+			}
+
+	    	default:
+	    		throw_error("Unrecognizable primary expression");
+
+	    		return 0;
+	    	}
+	    }
+	    
+	    // FilterExpr ::= PrimaryExpr | FilterExpr Predicate
+	    // Predicate ::= '[' PredicateExpr ']'
+	    // PredicateExpr ::= Expr
+	    xpath_ast_node* parse_filter_expression()
+	    {
+	    	xpath_ast_node* n = parse_primary_expression();
+
+	    	while (_lexer.current() == lex_open_square_brace)
+	    	{
+	    		_lexer.next();
+
+				xpath_ast_node* expr = parse_expression();
+
+				if (n->rettype() != xpath_type_node_set) throw_error("Predicate has to be applied to node set");
+
+				bool posinv = expr->rettype() != xpath_type_number && expr->is_posinv();
+
+	    		n = new (alloc_node()) xpath_ast_node(posinv ? ast_filter_posinv : ast_filter, xpath_type_node_set, n, expr);
+
+	    		if (_lexer.current() != lex_close_square_brace)
+	    			throw_error("Unmatched square brace");
+	    	
+	    		_lexer.next();
+	    	}
+	    	
+	    	return n;
+	    }
+	    
+	    // Step ::= AxisSpecifier NodeTest Predicate* | AbbreviatedStep
+	    // AxisSpecifier ::= AxisName '::' | '@'?
+	    // NodeTest ::= NameTest | NodeType '(' ')' | 'processing-instruction' '(' Literal ')'
+	    // NameTest ::= '*' | NCName ':' '*' | QName
+	    // AbbreviatedStep ::= '.' | '..'
+	    xpath_ast_node* parse_step(xpath_ast_node* set)
+	    {
+			if (set && set->rettype() != xpath_type_node_set)
+				throw_error("Step has to be applied to node set");
+
+			bool axis_specified = false;
+			axis_t axis = axis_child; // implied child axis
+
+			if (_lexer.current() == lex_axis_attribute)
+			{
+				axis = axis_attribute;
+				axis_specified = true;
+				
+				_lexer.next();
+			}
+			else if (_lexer.current() == lex_dot)
+			{
+				_lexer.next();
+				
+				return new (alloc_node()) xpath_ast_node(ast_step, set, axis_self, nodetest_type_node, 0);
+			}
+			else if (_lexer.current() == lex_double_dot)
+			{
+				_lexer.next();
+				
+				return new (alloc_node()) xpath_ast_node(ast_step, set, axis_parent, nodetest_type_node, 0);
+			}
+	    
+			nodetest_t nt_type = nodetest_none;
+			xpath_lexer_string nt_name;
+			
+			if (_lexer.current() == lex_string)
+			{
+				// node name test
+				nt_name = _lexer.contents();
+				_lexer.next();
+
+				// was it an axis name?
+				if (_lexer.current() == lex_double_colon)
+				{
+					// parse axis name
+					if (axis_specified) throw_error("Two axis specifiers in one step");
+
+					axis = parse_axis_name(nt_name, axis_specified);
+
+					if (!axis_specified) throw_error("Unknown axis");
+
+					// read actual node test
+					_lexer.next();
+
+					if (_lexer.current() == lex_multiply)
+					{
+						nt_type = nodetest_all;
+						nt_name = xpath_lexer_string();
+						_lexer.next();
+					}
+					else if (_lexer.current() == lex_string)
+					{
+						nt_name = _lexer.contents();
+						_lexer.next();
+					}
+					else throw_error("Unrecognized node test");
+				}
+				
+				if (nt_type == nodetest_none)
+				{
+					// node type test or processing-instruction
+					if (_lexer.current() == lex_open_brace)
+					{
+						_lexer.next();
+						
+						if (_lexer.current() == lex_close_brace)
+						{
+							_lexer.next();
+
+							nt_type = parse_node_test_type(nt_name);
+
+							if (nt_type == nodetest_none) throw_error("Unrecognized node type");
+							
+							nt_name = xpath_lexer_string();
+						}
+						else if (nt_name == PUGIXML_TEXT("processing-instruction"))
+						{
+							if (_lexer.current() != lex_quoted_string)
+								throw_error("Only literals are allowed as arguments to processing-instruction()");
+						
+							nt_type = nodetest_pi;
+							nt_name = _lexer.contents();
+							_lexer.next();
+							
+							if (_lexer.current() != lex_close_brace)
+								throw_error("Unmatched brace near processing-instruction()");
+							_lexer.next();
+						}
+						else
+							throw_error("Unmatched brace near node type test");
+
+					}
+					// QName or NCName:*
+					else
+					{
+						const char_t* colon_pos = pstd::find(nt_name.begin, nt_name.end, ':');
+
+						if (colon_pos + 2 == nt_name.end && colon_pos[1] == '*') // NCName:*
+						{
+							nt_name.end--; // erase *
+							
+							nt_type = nodetest_all_in_namespace;
+						}
+						else nt_type = nodetest_name;
+					}
+				}
+			}
+			else if (_lexer.current() == lex_multiply)
+			{
+				nt_type = nodetest_all;
+				_lexer.next();
+			}
+			else throw_error("Unrecognized node test");
+			
+			xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_step, set, axis, nt_type, alloc_string(nt_name));
+			
+			xpath_ast_node* last = 0;
+			
+			while (_lexer.current() == lex_open_square_brace)
+			{
+				_lexer.next();
+				
+				xpath_ast_node* expr = parse_expression();
+
+				xpath_ast_node* pred = new (alloc_node()) xpath_ast_node(ast_predicate, xpath_type_node_set, expr);
+				
+				if (_lexer.current() != lex_close_square_brace)
+	    			throw_error("Unmatched square brace");
+				_lexer.next();
+				
+				if (last) last->set_next(pred);
+				else n->set_right(pred);
+				
+				last = pred;
+			}
+			
+			return n;
+	    }
+	    
+	    // RelativeLocationPath ::= Step | RelativeLocationPath '/' Step | RelativeLocationPath '//' Step
+	    xpath_ast_node* parse_relative_location_path(xpath_ast_node* set)
+	    {
+			xpath_ast_node* n = parse_step(set);
+			
+			while (_lexer.current() == lex_slash || _lexer.current() == lex_double_slash)
+			{
+				lexeme_t l = _lexer.current();
+				_lexer.next();
+
+				if (l == lex_double_slash)
+					n = new (alloc_node()) xpath_ast_node(ast_step, n, axis_descendant_or_self, nodetest_type_node, 0);
+				
+				n = parse_step(n);
+			}
+			
+			return n;
+	    }
+	    
+	    // LocationPath ::= RelativeLocationPath | AbsoluteLocationPath
+	    // AbsoluteLocationPath ::= '/' RelativeLocationPath? | '//' RelativeLocationPath
+	    xpath_ast_node* parse_location_path()
+	    {
+			if (_lexer.current() == lex_slash)
+			{
+				_lexer.next();
+				
+				xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_step_root, xpath_type_node_set);
+
+				// relative location path can start from axis_attribute, dot, double_dot, multiply and string lexemes; any other lexeme means standalone root path
+				lexeme_t l = _lexer.current();
+
+				if (l == lex_string || l == lex_axis_attribute || l == lex_dot || l == lex_double_dot || l == lex_multiply)
+					return parse_relative_location_path(n);
+				else
+					return n;
+			}
+			else if (_lexer.current() == lex_double_slash)
+			{
+				_lexer.next();
+				
+				xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_step_root, xpath_type_node_set);
+				n = new (alloc_node()) xpath_ast_node(ast_step, n, axis_descendant_or_self, nodetest_type_node, 0);
+				
+				return parse_relative_location_path(n);
+			}
+			else
+			{
+				return parse_relative_location_path(0);
+			}
+	    }
+	    
+	    // PathExpr ::= LocationPath
+	    //				| FilterExpr
+	    //				| FilterExpr '/' RelativeLocationPath
+	    //				| FilterExpr '//' RelativeLocationPath
+	    xpath_ast_node* parse_path_expression()
+	    {
+			// Clarification.
+			// PathExpr begins with either LocationPath or FilterExpr.
+			// FilterExpr begins with PrimaryExpr
+			// PrimaryExpr begins with '$' in case of it being a variable reference,
+			// '(' in case of it being an expression, string literal, number constant or
+			// function call.
+
+			if (_lexer.current() == lex_var_ref || _lexer.current() == lex_open_brace || 
+				_lexer.current() == lex_quoted_string || _lexer.current() == lex_number ||
+				_lexer.current() == lex_string)
+	    	{
+	    		if (_lexer.current() == lex_string)
+	    		{
+	    			// This is either a function call, or not - if not, we shall proceed with location path
+	    			const char_t* state = _lexer.state();
+	    			
+					while (IS_CHARTYPEX(*state, ctx_space)) ++state;
+	    			
+	    			if (*state != '(') return parse_location_path();
+
+					// This looks like a function call; however this still can be a node-test. Check it.
+					if (parse_node_test_type(_lexer.contents()) != nodetest_none) return parse_location_path();
+	    		}
+	    		
+	    		xpath_ast_node* n = parse_filter_expression();
+
+	    		if (_lexer.current() == lex_slash || _lexer.current() == lex_double_slash)
+	    		{
+					lexeme_t l = _lexer.current();
+	    			_lexer.next();
+	    			
+					if (l == lex_double_slash)
+					{
+						if (n->rettype() != xpath_type_node_set) throw_error("Step has to be applied to node set");
+
+						n = new (alloc_node()) xpath_ast_node(ast_step, n, axis_descendant_or_self, nodetest_type_node, 0);
+					}
+	
+	    			// select from location path
+	    			return parse_relative_location_path(n);
+	    		}
+
+	    		return n;
+	    	}
+	    	else return parse_location_path();
+	    }
+
+	    // UnionExpr ::= PathExpr | UnionExpr '|' PathExpr
+	    xpath_ast_node* parse_union_expression()
+	    {
+	    	xpath_ast_node* n = parse_path_expression();
+
+	    	while (_lexer.current() == lex_union)
+	    	{
+	    		_lexer.next();
+
+				xpath_ast_node* expr = parse_union_expression();
+
+				if (n->rettype() != xpath_type_node_set || expr->rettype() != xpath_type_node_set)
+					throw_error("Union operator has to be applied to node sets");
+
+	    		n = new (alloc_node()) xpath_ast_node(ast_op_union, xpath_type_node_set, n, expr);
+	    	}
+
+	    	return n;
+	    }
+
+	    // UnaryExpr ::= UnionExpr | '-' UnaryExpr
+	    xpath_ast_node* parse_unary_expression()
+	    {
+	    	if (_lexer.current() == lex_minus)
+	    	{
+	    		_lexer.next();
+
+				xpath_ast_node* expr = parse_unary_expression();
+
+	    		return new (alloc_node()) xpath_ast_node(ast_op_negate, xpath_type_number, expr);
+	    	}
+	    	else return parse_union_expression();
+	    }
+	    
+	    // MultiplicativeExpr ::= UnaryExpr
+	    //						  | MultiplicativeExpr '*' UnaryExpr
+	    //						  | MultiplicativeExpr 'div' UnaryExpr
+	    //						  | MultiplicativeExpr 'mod' UnaryExpr
+	    xpath_ast_node* parse_multiplicative_expression()
+	    {
+	    	xpath_ast_node* n = parse_unary_expression();
+
+	    	while (_lexer.current() == lex_multiply || (_lexer.current() == lex_string &&
+	    		   (_lexer.contents() == PUGIXML_TEXT("mod") || _lexer.contents() == PUGIXML_TEXT("div"))))
+	    	{
+	    		ast_type_t op = _lexer.current() == lex_multiply ? ast_op_multiply :
+	    			_lexer.contents().begin[0] == 'd' ? ast_op_divide : ast_op_mod;
+	    		_lexer.next();
+
+				xpath_ast_node* expr = parse_unary_expression();
+
+	    		n = new (alloc_node()) xpath_ast_node(op, xpath_type_number, n, expr);
+	    	}
+
+	    	return n;
+	    }
+
+	    // AdditiveExpr ::= MultiplicativeExpr
+	    //					| AdditiveExpr '+' MultiplicativeExpr
+	    //					| AdditiveExpr '-' MultiplicativeExpr
+	    xpath_ast_node* parse_additive_expression()
+	    {
+	    	xpath_ast_node* n = parse_multiplicative_expression();
+
+	    	while (_lexer.current() == lex_plus || _lexer.current() == lex_minus)
+	    	{
+	    		lexeme_t l = _lexer.current();
+
+	    		_lexer.next();
+
+				xpath_ast_node* expr = parse_multiplicative_expression();
+
+	    		n = new (alloc_node()) xpath_ast_node(l == lex_plus ? ast_op_add : ast_op_subtract, xpath_type_number, n, expr);
+	    	}
+
+	    	return n;
+	    }
+
+	    // RelationalExpr ::= AdditiveExpr
+	    //					  | RelationalExpr '<' AdditiveExpr
+	    //					  | RelationalExpr '>' AdditiveExpr
+	    //					  | RelationalExpr '<=' AdditiveExpr
+	    //					  | RelationalExpr '>=' AdditiveExpr
+	    xpath_ast_node* parse_relational_expression()
+	    {
+	    	xpath_ast_node* n = parse_additive_expression();
+
+	    	while (_lexer.current() == lex_less || _lexer.current() == lex_less_or_equal || 
+	    		   _lexer.current() == lex_greater || _lexer.current() == lex_greater_or_equal)
+	    	{
+	    		lexeme_t l = _lexer.current();
+	    		_lexer.next();
+
+				xpath_ast_node* expr = parse_additive_expression();
+
+	    		n = new (alloc_node()) xpath_ast_node(l == lex_less ? ast_op_less : l == lex_greater ? ast_op_greater :
+	    						l == lex_less_or_equal ? ast_op_less_or_equal : ast_op_greater_or_equal, xpath_type_boolean, n, expr);
+	    	}
+
+	    	return n;
+	    }
+	    
+	    // EqualityExpr ::= RelationalExpr
+	    //					| EqualityExpr '=' RelationalExpr
+	    //					| EqualityExpr '!=' RelationalExpr
+	    xpath_ast_node* parse_equality_expression()
+	    {
+	    	xpath_ast_node* n = parse_relational_expression();
+
+	    	while (_lexer.current() == lex_equal || _lexer.current() == lex_not_equal)
+	    	{
+	    		lexeme_t l = _lexer.current();
+
+	    		_lexer.next();
+
+				xpath_ast_node* expr = parse_relational_expression();
+
+	    		n = new (alloc_node()) xpath_ast_node(l == lex_equal ? ast_op_equal : ast_op_not_equal, xpath_type_boolean, n, expr);
+	    	}
+
+	    	return n;
+	    }
+	    
+	    // AndExpr ::= EqualityExpr | AndExpr 'and' EqualityExpr
+	    xpath_ast_node* parse_and_expression()
+	    {
+	    	xpath_ast_node* n = parse_equality_expression();
+
+	    	while (_lexer.current() == lex_string && _lexer.contents() == PUGIXML_TEXT("and"))
+	    	{
+	    		_lexer.next();
+
+				xpath_ast_node* expr = parse_equality_expression();
+
+	    		n = new (alloc_node()) xpath_ast_node(ast_op_and, xpath_type_boolean, n, expr);
+	    	}
+
+	    	return n;
+	    }
+
+	    // OrExpr ::= AndExpr | OrExpr 'or' AndExpr
+	    xpath_ast_node* parse_or_expression()
+	    {
+	    	xpath_ast_node* n = parse_and_expression();
+
+	    	while (_lexer.current() == lex_string && _lexer.contents() == PUGIXML_TEXT("or"))
+	    	{
+	    		_lexer.next();
+
+				xpath_ast_node* expr = parse_and_expression();
+
+	    		n = new (alloc_node()) xpath_ast_node(ast_op_or, xpath_type_boolean, n, expr);
+	    	}
+
+	    	return n;
+	    }
+		
+		// Expr ::= OrExpr
+		xpath_ast_node* parse_expression()
+		{
+			return parse_or_expression();
+		}
+
+		xpath_parser(const char_t* query, xpath_allocator& alloc, xpath_parse_result* result): _alloc(alloc), _lexer(query), _query(query), _result(result)
+		{
+		}
+
+		xpath_ast_node* parse()
+		{
+			xpath_ast_node* result = parse_expression();
+			
+			if (_lexer.current() != lex_eof)
+			{
+				// there are still unparsed tokens left, error
+				throw_error("Incorrect query");
+			}
+			
+			return result;
+		}
+
+		static xpath_ast_node* parse(const char_t* query, xpath_allocator& alloc, xpath_parse_result* result)
+		{
+			xpath_parser parser(query, alloc, result);
+
+			int error = setjmp(parser._error_handler);
+
+			return (error == 0) ? parser.parse() : 0;
+		}
+	};
+
+	const char* xpath_parse_result::description() const
+	{
+		return error ? error : "No error";
+	}
+
+	xpath_query::xpath_query(const char_t* query): _alloc(0), _root(0)
+	{
+		_result.error = 0;
+		_result.offset = 0;
+
+		_alloc = xpath_allocator::create();
+
+		if (!_alloc)
+		{
+			_result.error = "Out of memory";
+		}
+		else
+		{
+			_root = xpath_parser::parse(query, *_alloc, &_result);
+		}
+
+		if (!_root)
+		{
+			xpath_allocator::destroy(_alloc);
+			_alloc = 0;
+
+		#ifndef PUGIXML_NO_EXCEPTIONS
+			throw xpath_exception(_result);
+		#endif
+		}
+	}
+
+	xpath_query::~xpath_query()
+	{
+		xpath_allocator::destroy(_alloc);
+	}
+
+	xpath_value_type xpath_query::return_type() const
+	{
+		if (!_root) return xpath_type_none;
+
+		return _root->rettype();
+	}
+
+	bool xpath_query::evaluate_boolean(const xpath_node& n) const
+	{
+		if (!_root) return false;
+		
+		xpath_context c(n, 1, 1);
+		
+		return _root->eval_boolean(c);
+	}
+	
+	double xpath_query::evaluate_number(const xpath_node& n) const
+	{
+		if (!_root) return gen_nan();
+		
+		xpath_context c(n, 1, 1);
+		
+		return _root->eval_number(c);
+	}
+	
+#ifndef PUGIXML_NO_STL
+	string_t xpath_query::evaluate_string(const xpath_node& n) const
+	{
+		if (!_root) return string_t();
+		
+		xpath_context c(n, 1, 1);
+		
+		return _root->eval_string(c).c_str();
+	}
+#endif
+	
+	size_t xpath_query::evaluate_string(char_t* buffer, size_t capacity, const xpath_node& n) const
+	{
+		xpath_context c(n, 1, 1);
+		xpath_string r = _root ? _root->eval_string(c) : xpath_string();
+
+		size_t size = r.length() + 1;
+		
+		// $$ zero-terminate?
+		if (capacity > 0) memcpy(buffer, r.c_str(), (size < capacity ? size : capacity) * sizeof(char_t));
+		
+		return size;
+	}
+
+	xpath_node_set xpath_query::evaluate_node_set(const xpath_node& n) const
+	{
+		if (!_root) return xpath_node_set();
+
+		if (_root->rettype() != xpath_type_node_set)
+		{
+		#ifdef PUGIXML_NO_EXCEPTIONS
+			return xpath_node_set();
+		#else
+			xpath_parse_result result = {"Expression does not evaluate to node set", 0};
+			throw xpath_exception(result);
+		#endif
+		}
+		
+		xpath_context c(n, 1, 1);
+		
+		return _root->eval_node_set(c);
+	}
+
+	const xpath_parse_result& xpath_query::result() const
+	{
+		return _result;
+	}
+
+	xpath_query::operator unspecified_bool_type() const
+	{
+		return _root ? &xpath_query::_root : 0;
+	}
+
+	bool xpath_query::operator!() const
+	{
+		return !_root;
+	}
+
+	xpath_node xml_node::select_single_node(const char_t* query) const
+	{
+		xpath_query q(query);
+		return select_single_node(q);
+	}
+
+	xpath_node xml_node::select_single_node(const xpath_query& query) const
+	{
+		xpath_node_set s = query.evaluate_node_set(*this);
+		return s.empty() ? xpath_node() : s.first();
+	}
+
+	xpath_node_set xml_node::select_nodes(const char_t* query) const
+	{
+		xpath_query q(query);
+		return select_nodes(q);
+	}
+
+	xpath_node_set xml_node::select_nodes(const xpath_query& query) const
+	{
+		return query.evaluate_node_set(*this);
+	}
+}
+
+#endif
+
 /**
  * Copyright (c) 2006-2010 Arseny Kapoulkine
  *
diff --git a/src/pugixpath.cpp b/src/pugixpath.cpp
deleted file mode 100644
index 7ab466c..0000000
--- a/src/pugixpath.cpp
+++ /dev/null
@@ -1,3890 +0,0 @@
-/**
- * pugixml parser - version 0.9
- * --------------------------------------------------------
- * Copyright (C) 2006-2010, by Arseny Kapoulkine (arseny.kapoulkine@gmail.com)
- * Report bugs and download new versions at http://code.google.com/p/pugixml/
- *
- * This library is distributed under the MIT License. See notice at the end
- * of this file.
- *
- * This work is based on the pugxml parser, which is:
- * Copyright (C) 2003, by Kristen Wegner (kristen@tima.net)
- */
-
-#include "pugixml.hpp"
-
-#ifndef PUGIXML_NO_XPATH
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <assert.h>
-#include <setjmp.h>
-#include <ctype.h>
-#include <math.h>
-#include <float.h>
-
-#ifdef PUGIXML_WCHAR_MODE
-#	include <wchar.h>
-#endif
-
-#include <new>
-
-#ifndef PUGIXML_NO_STL
-#	include <string>
-#endif
-
-// int32_t
-#if !defined(_MSC_VER) || _MSC_VER >= 1600
-#	include <stdint.h>
-#else
-typedef __int32 int32_t;
-#endif
-
-#if defined(_MSC_VER)
-#	pragma warning(disable: 4127) // conditional expression is constant
-#	pragma warning(disable: 4324) // structure was padded due to __declspec(align())
-#	pragma warning(disable: 4611) // interaction between '_setjmp' and C++ object destruction is non-portable
-#	pragma warning(disable: 4702) // unreachable code
-#	pragma warning(disable: 4996) // this function or variable may be unsafe
-#endif
-
-#ifdef __INTEL_COMPILER
-#	pragma warning(disable: 1478 1786) // function was declared "deprecated"
-#endif
-
-#ifdef __SNC__
-#	pragma diag_suppress=237 // controlling expression is constant
-#endif
-
-// String utilities prototypes
-namespace pugi
-{
-	namespace impl
-	{
-		size_t strlen(const char_t* s);
-		bool strequal(const char_t* src, const char_t* dst);
-		bool strequalrange(const char_t* lhs, const char_t* rhs, size_t count);
-		void widen_ascii(wchar_t* dest, const char* source);
-	}
-}
-
-// STL replacements
-namespace pstd
-{
-	struct equal_to
-	{
-		template <typename T> bool operator()(const T& lhs, const T& rhs) const
-		{
-			return lhs == rhs;
-		}
-	};
-
-	struct not_equal_to
-	{
-		template <typename T> bool operator()(const T& lhs, const T& rhs) const
-		{
-			return lhs != rhs;
-		}
-	};
-
-	struct less
-	{
-		template <typename T> bool operator()(const T& lhs, const T& rhs) const
-		{
-			return lhs < rhs;
-		}
-	};
-
-	struct less_equal
-	{
-		template <typename T> bool operator()(const T& lhs, const T& rhs) const
-		{
-			return lhs <= rhs;
-		}
-	};
-
-	template <typename T> void swap(T& lhs, T& rhs)
-	{
-		T temp = lhs;
-		lhs = rhs;
-		rhs = temp;
-	}
-
-	template <typename I, typename J> void copy(I begin, I end, J target)
-	{
-		while (begin != end) *target++ = *begin++;
-	}
-
-	template <typename I, typename T> I find(I begin, I end, T elem)
-	{
-		for (I it = begin; it != end; ++it)
-			if (*it == elem)
-				return it;
-
-		return end;
-	}
-
-	template <typename I, typename Pred> I min_element(I begin, I end, const Pred& pred)
-	{
-		I result = begin;
-
-		for (I it = begin + 1; it != end; ++it)
-			if (pred(*it, *result))
-				result = it;
-
-		return result;
-	}
-
-	template <typename I> void reverse(I begin, I end)
-	{
-		while (begin + 1 < end) swap(*begin++, *--end);
-	}
-
-	template <typename I> I unique(I begin, I end)
-	{
-		// fast skip head
-		while (begin + 1 < end && *begin != *(begin + 1)) begin++;
-
-		if (begin == end) return begin;
-
-		// last written element
-		I write = begin++; 
-
-		// merge unique elements
-		while (begin != end)
-		{
-			if (*begin != *write)
-				*++write = *begin++;
-			else
-				begin++;
-		}
-
-		// past-the-end (write points to live element)
-		return write + 1;
-	}
-
-	template <typename I, typename Pred> void sort(I begin, I end, const Pred& pred)
-	{
-		while (begin != end) swap(*begin, *min_element(begin, end, pred)), begin++;
-	}
-}
-
-namespace
-{
-	using namespace pugi;
-
-	class xpath_string
-	{
-		const char_t* _buffer;
-		bool _uses_heap;
-
-		static char_t* duplicate_string(const char_t* string, size_t length)
-		{
-			char_t* result = static_cast<char_t*>(get_memory_allocation_function()((length + 1) * sizeof(char_t)));
-			if (!result) return 0; // $$ out of memory
-
-			memcpy(result, string, length * sizeof(char_t));
-			result[length] = 0;
-
-			return result;
-		}
-
-		static char_t* duplicate_string(const char_t* string)
-		{
-			return duplicate_string(string, impl::strlen(string));
-		}
-
-	public:
-		xpath_string(): _buffer(PUGIXML_TEXT("")), _uses_heap(false)
-		{
-		}
-
-		~xpath_string()
-		{
-			if (_uses_heap) get_memory_deallocation_function()(const_cast<char_t*>(_buffer));
-		}
-
-		explicit xpath_string(const char_t* str)
-		{
-			bool empty = (*str == 0);
-
-			_buffer = empty ? PUGIXML_TEXT("") : duplicate_string(str);
-			_uses_heap = !empty;
-		}
-
-		explicit xpath_string(const char_t* str, bool use_heap): _buffer(str), _uses_heap(use_heap)
-		{
-		}
-
-		xpath_string(const char_t* begin, const char_t* end)
-		{
-			assert(begin <= end);
-
-			if (begin != end)
-			{
-				_buffer = duplicate_string(begin, static_cast<size_t>(end - begin));
-				_uses_heap = true;
-			}
-			else
-			{
-				_buffer = PUGIXML_TEXT("");
-				_uses_heap = false;
-			}
-		}
-
-		xpath_string(const xpath_string& o)
-		{
-			_buffer = o._uses_heap ? duplicate_string(o._buffer) : o._buffer;
-			_uses_heap = o._uses_heap;
-		}
-
-		xpath_string& operator=(const xpath_string& o)
-		{
-			xpath_string temp(o);
-			swap(temp);
-
-			return *this;
-		}
-
-		void swap(xpath_string& o)
-		{
-			pstd::swap(_buffer, o._buffer);
-			pstd::swap(_uses_heap, o._uses_heap);
-		}
-
-		void append(const xpath_string& o)
-		{
-			// skip empty sources
-			if (!*o._buffer) return;
-
-			// fast append for empty target and constant source
-			if (!*_buffer && !o._uses_heap)
-			{
-				_buffer = o._buffer;
-				_uses_heap = false;
-			}
-			else
-			{
-				// need to make heap copy
-				size_t target_length = impl::strlen(_buffer);
-				size_t source_length = impl::strlen(o._buffer);
-				size_t length = target_length + source_length;
-
-				// allocate new buffer
-				char_t* result = static_cast<char_t*>(get_memory_allocation_function()((length + 1) * sizeof(char_t)));
-				if (!result) return; // $$ out of memory
-
-				// append both strings in the new buffer
-				memcpy(result, _buffer, target_length * sizeof(char_t));
-				memcpy(result + target_length, o._buffer, source_length * sizeof(char_t));
-				result[length] = 0;
-
-				// finalize
-				xpath_string(result, true).swap(*this);
-			}
-		}
-
-		const char_t* c_str() const
-		{
-			return _buffer;
-		}
-
-		size_t length() const
-		{
-			return impl::strlen(_buffer);
-		}
-		
-		char_t* data()
-		{
-			// make private heap copy
-			if (!_uses_heap)
-			{
-				_buffer = duplicate_string(_buffer);
-				_uses_heap = true;
-			}
-
-			return const_cast<char_t*>(_buffer);
-		}
-
-		bool empty() const
-		{
-			return *_buffer == 0;
-		}
-
-		bool operator==(const xpath_string& o) const
-		{
-			return impl::strequal(_buffer, o._buffer);
-		}
-
-		bool operator!=(const xpath_string& o) const
-		{
-			return !impl::strequal(_buffer, o._buffer);
-		}
-	};
-
-	xpath_string xpath_string_const(const char_t* str)
-	{
-		return xpath_string(str, false);
-	}
-}
-
-namespace
-{
-	using namespace pugi;
-		
-	enum chartypex
-	{
-		ctx_space = 1,			// \r, \n, space, tab
-		ctx_start_symbol = 2,	// Any symbol > 127, a-z, A-Z, _
-		ctx_digit = 4,			// 0-9
-		ctx_symbol = 8			// Any symbol > 127, a-z, A-Z, 0-9, _, -, .
-	};
-	
-	const unsigned char chartypex_table[256] =
-	{
-		0,  0,  0,  0,  0,  0,  0,  0,     0,  1,  1,  0,  0,  1,  0,  0,     // 0-15
-		0,  0,  0,  0,  0,  0,  0,  0,     0,  0,  0,  0,  0,  0,  0,  0,     // 16-31
-		1,  0,  0,  0,  0,  0,  0,  0,     0,  0,  0,  0,  0,  8,  8,  0,     // 32-47
-		12, 12, 12, 12, 12, 12, 12, 12,    12, 12, 0,  0,  0,  0,  0,  0,     // 48-63
-		0,  10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,    // 64-79
-		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 0,  0,  0,  0,  10,    // 80-95
-		0,  10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,    // 96-111
-		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 0,  0,  0,  0,  0,     // 112-127
-
-		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,    // 128+
-		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
-		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
-		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
-		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
-		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
-		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10,
-		10, 10, 10, 10, 10, 10, 10, 10,    10, 10, 10, 10, 10, 10, 10, 10
-	};
-	
-#ifdef PUGIXML_WCHAR_MODE
-	#define IS_CHARTYPEX(c, ct) ((static_cast<unsigned int>(c) < 128 ? chartypex_table[static_cast<unsigned int>(c)] : chartypex_table[128]) & (ct))
-#else
-	#define IS_CHARTYPEX(c, ct) (chartypex_table[static_cast<unsigned char>(c)] & (ct))
-#endif
-
-	bool starts_with(const char_t* string, const char_t* pattern)
-	{
-		while (*pattern && *string == *pattern)
-		{
-			string++;
-			pattern++;
-		}
-
-		return *pattern == 0;
-	}
-
-	const char_t* find_char(const char_t* s, char_t c)
-	{
-	#ifdef PUGIXML_WCHAR_MODE
-		return wcschr(s, c);
-	#else
-		return strchr(s, c);
-	#endif
-	}
-
-	const char_t* find_substring(const char_t* s, const char_t* p)
-	{
-	#ifdef PUGIXML_WCHAR_MODE
-		return wcsstr(s, p);
-	#else
-		return strstr(s, p);
-	#endif
-	}
-
-	xpath_string string_value(const xpath_node& na)
-	{
-		if (na.attribute())
-			return xpath_string_const(na.attribute().value());
-		else
-		{
-			const xml_node& n = na.node();
-
-			switch (n.type())
-			{
-			case node_pcdata:
-			case node_cdata:
-			case node_comment:
-			case node_pi:
-				return xpath_string_const(n.value());
-			
-			case node_document:
-			case node_element:
-			{
-				xpath_string result;
-
-				xml_node cur = n.first_child();
-				
-				while (cur && cur != n)
-				{
-					if (cur.type() == node_pcdata || cur.type() == node_cdata)
-						result.append(xpath_string_const(cur.value()));
-
-					if (cur.first_child())
-						cur = cur.first_child();
-					else if (cur.next_sibling())
-						cur = cur.next_sibling();
-					else
-					{
-						while (!cur.next_sibling() && cur != n)
-							cur = cur.parent();
-
-						if (cur != n) cur = cur.next_sibling();
-					}
-				}
-				
-				return result;
-			}
-			
-			default:
-				return xpath_string();
-			}
-		}
-	}
-	
-	unsigned int node_height(xml_node n)
-	{
-	    unsigned int result = 0;
-	    
-	    while (n)
-	    {
-	        ++result;
-	        n = n.parent();
-	    }
-	    
-	    return result;
-	}
-	
-	// precondition: node_height of ln is <= node_height of rn, ln != rn
-	bool node_is_before(xml_node ln, unsigned int lh, xml_node rn, unsigned int rh)
-	{
-	    assert(lh <= rh);
-	    
-	    while (lh < rh)
-	    {
-	        --rh;
-	        rn = rn.parent();
-	    }
-	    
-	    if (ln == rn) return true;
-	    
-	    while (ln.parent() != rn.parent())
-	    {
-	        ln = ln.parent();
-	        rn = rn.parent();
-	    }
-	    
-        for (; ln; ln = ln.next_sibling())
-            if (ln == rn)
-                return true;
-                
-        return false;
-    }
-
-    bool node_is_ancestor(xml_node parent, xml_node node)
-    {
-    	while (node && node != parent) node = node.parent();
-
-    	return parent && node == parent;
-    }
-    
-	struct document_order_comparator
-	{
-		bool operator()(const xpath_node& lhs, const xpath_node& rhs) const
-		{
-			xml_node ln = lhs.node(), rn = rhs.node();
-
-			const void* lo = lhs.attribute() ? lhs.attribute().document_order() : ln.document_order();
-			const void* ro = rhs.attribute() ? rhs.attribute().document_order() : rn.document_order();
-
-			if (lo && ro) return lo < ro;
-
-			if (lhs.attribute() && rhs.attribute())
-			{
-				if (lhs.parent() == rhs.parent())
-				{
-				    for (xml_attribute a = lhs.attribute(); a; a = a.next_attribute())
-				        if (a == rhs.attribute())
-				            return true;
-				    
-				    return false;
-				}
-				
-				ln = lhs.parent();
-				rn = rhs.parent();
-			}
-			else if (lhs.attribute())
-			{
-				if (lhs.parent() == rhs.node()) return false;
-				
-				ln = lhs.parent();
-			}
-			else if (rhs.attribute())
-			{
-				if (rhs.parent() == lhs.node()) return true;
-				
-				rn = rhs.parent();
-			}
-
-			if (ln == rn) return false;
-			
-			unsigned int lh = node_height(ln);
-			unsigned int rh = node_height(rn);
-			
-			return (lh <= rh) ? node_is_before(ln, lh, rn, rh) : !node_is_before(rn, rh, ln, lh);
-		}
-	};
-
-	struct duplicate_comparator
-	{
-		bool operator()(const xpath_node& lhs, const xpath_node& rhs) const
-		{
-			if (lhs.attribute()) return rhs.attribute() ? lhs.attribute() < rhs.attribute() : true;
-			else return rhs.attribute() ? false : lhs.node() < rhs.node();
-		}
-	};
-	
-	double gen_nan()
-	{
-	#if defined(__STDC_IEC_559__) || ((FLT_RADIX - 0 == 2) && (FLT_MAX_EXP - 0 == 128) && (FLT_MANT_DIG - 0 == 24))
-		union { float f; int32_t i; } u[sizeof(float) == sizeof(int32_t) ? 1 : -1];
-		u[0].i = 0x7fc00000;
-		return u[0].f;
-	#else
-		// fallback
-		const volatile double zero = 0.0;
-		return zero / zero;
-	#endif
-	}
-	
-	bool is_nan(double value)
-	{
-	#if defined(_MSC_VER) || defined(__BORLANDC__)
-		return !!_isnan(value);
-	#elif defined(fpclassify) && defined(FP_NAN)
-		return fpclassify(value) == FP_NAN;
-	#else
-		// fallback
-		const volatile double v = value;
-		return v != v;
-	#endif
-	}
-	
-	const char_t* convert_number_to_string_special(double value)
-	{
-	#if defined(_MSC_VER) || defined(__BORLANDC__)
-		if (_finite(value)) return (value == 0) ? PUGIXML_TEXT("0") : 0;
-		if (_isnan(value)) return PUGIXML_TEXT("NaN");
-		return PUGIXML_TEXT("-Infinity") + (value > 0);
-	#elif defined(fpclassify) && defined(FP_NAN) && defined(FP_INFINITE) && defined(FP_ZERO)
-		switch (fpclassify(value))
-		{
-		case FP_NAN:
-			return PUGIXML_TEXT("NaN");
-
-		case FP_INFINITE:
-			return PUGIXML_TEXT("-Infinity") + (value > 0);
-
-		case FP_ZERO:
-			return PUGIXML_TEXT("0");
-
-		default:
-			return 0;
-		}
-	#else
-		// fallback
-		const volatile double v = value;
-
-		if (v == 0) return PUGIXML_TEXT("0");
-		if (v != v) return PUGIXML_TEXT("NaN");
-		if (v * 2 == v) return PUGIXML_TEXT("-Infinity") + (value > 0);
-		return 0;
-	#endif
-	}
-	
-	bool convert_number_to_boolean(double value)
-	{
-		return (value != 0 && !is_nan(value));
-	}
-	
-	void truncate_zeros(char* begin, char* end)
-	{
-		while (begin != end && end[-1] == '0') end--;
-
-		*end = 0;
-	}
-
-	// gets mantissa digits in the form of 0.xxxxx with 0. implied and the exponent
-#if defined(_MSC_VER) && _MSC_VER >= 1400
-	void convert_number_to_mantissa_exponent(double value, char* buffer, size_t buffer_size, char** out_mantissa, int* out_exponent)
-	{
-		// get base values
-		int sign, exponent;
-		_ecvt_s(buffer, buffer_size, value, DBL_DIG + 1, &exponent, &sign);
-
-		// truncate redundant zeros
-		truncate_zeros(buffer, buffer + strlen(buffer));
-
-		// fill results
-		*out_mantissa = buffer;
-		*out_exponent = exponent;
-	}
-#else
-	void convert_number_to_mantissa_exponent(double value, char* buffer, size_t buffer_size, char** out_mantissa, int* out_exponent)
-	{
-		// get a scientific notation value with IEEE DBL_DIG decimals
-		sprintf(buffer, "%.*e", DBL_DIG, value);
-		assert(strlen(buffer) < buffer_size);
-		(void)!buffer_size;
-
-		// get the exponent (possibly negative)
-		char* exponent_string = strchr(buffer, 'e');
-		assert(exponent_string);
-
-		int exponent = atoi(exponent_string + 1);
-
-		// extract mantissa string: skip sign
-		char* mantissa = buffer[0] == '-' ? buffer + 1 : buffer;
-		assert(mantissa[0] != '0' && mantissa[1] == '.');
-
-		// divide mantissa by 10 to eliminate integer part
-		mantissa[1] = mantissa[0];
-		mantissa++;
-		exponent++;
-
-		// remove extra mantissa digits and zero-terminate mantissa
-		truncate_zeros(mantissa, exponent_string);
-
-		// fill results
-		*out_mantissa = mantissa;
-		*out_exponent = exponent;
-	}
-#endif
-
-	xpath_string convert_number_to_string(double value)
-	{
-		// try special number conversion
-		const char_t* special = convert_number_to_string_special(value);
-		if (special) return xpath_string_const(special);
-
-		// get mantissa + exponent form
-		char mantissa_buffer[64];
-
-		char* mantissa;
-		int exponent;
-		convert_number_to_mantissa_exponent(value, mantissa_buffer, sizeof(mantissa_buffer), &mantissa, &exponent);
-
-		// make the number!
-		char_t result[512];
-		char_t* s = result;
-
-		// sign
-		if (value < 0) *s++ = '-';
-
-		// integer part
-		if (exponent <= 0)
-		{
-			*s++ = '0';
-		}
-		else
-		{
-			while (exponent > 0)
-			{
-				assert(*mantissa == 0 || (unsigned)(*mantissa - '0') <= 9);
-				*s++ = *mantissa ? *mantissa++ : '0';
-				exponent--;
-			}
-		}
-
-		// fractional part
-		if (*mantissa)
-		{
-			// decimal point
-			*s++ = '.';
-
-			// extra zeroes from negative exponent
-			while (exponent < 0)
-			{
-				*s++ = '0';
-				exponent++;
-			}
-
-			// extra mantissa digits
-			while (*mantissa)
-			{
-				assert((unsigned)(*mantissa - '0') <= 9);
-				*s++ = *mantissa++;
-			}
-		}
-
-		// zero-terminate
-		assert(s < result + sizeof(result) / sizeof(result[0]));
-		*s = 0;
-
-		return xpath_string(result);
-	}
-	
-	bool check_string_to_number_format(const char_t* string)
-	{
-		// parse leading whitespace
-		while (IS_CHARTYPEX(*string, ctx_space)) ++string;
-
-		// parse sign
-		if (*string == '-') ++string;
-
-		if (!*string) return false;
-
-		// if there is no integer part, there should be a decimal part with at least one digit
-		if (!IS_CHARTYPEX(string[0], ctx_digit) && (string[0] != '.' || !IS_CHARTYPEX(string[1], ctx_digit))) return false;
-
-		// parse integer part
-		while (IS_CHARTYPEX(*string, ctx_digit)) ++string;
-
-		// parse decimal part
-		if (*string == '.')
-		{
-			++string;
-
-			while (IS_CHARTYPEX(*string, ctx_digit)) ++string;
-		}
-
-		// parse trailing whitespace
-		while (IS_CHARTYPEX(*string, ctx_space)) ++string;
-
-		return *string == 0;
-	}
-
-	double convert_string_to_number(const char_t* string)
-	{
-		// check string format
-		if (!check_string_to_number_format(string)) return gen_nan();
-
-		// parse string
-	#ifdef PUGIXML_WCHAR_MODE
-		return wcstod(string, 0);
-	#else
-		return atof(string);
-	#endif
-	}
-
-	bool convert_string_to_number(const char_t* begin, const char_t* end, double* out_result)
-	{
-		char_t buffer[32];
-
-		size_t length = static_cast<size_t>(end - begin);
-		char_t* scratch = buffer;
-
-		if (length >= sizeof(buffer) / sizeof(buffer[0]))
-		{
-			// need to make dummy on-heap copy
-			scratch = static_cast<char_t*>(get_memory_allocation_function()((length + 1) * sizeof(char_t)));
-			if (!scratch) return false;
-		}
-
-		// copy string to zero-terminated buffer and perform conversion
-		memcpy(scratch, begin, length * sizeof(char_t));
-		scratch[length] = 0;
-
-		*out_result = convert_string_to_number(scratch);
-
-		// free dummy buffer
-		if (scratch != buffer) get_memory_deallocation_function()(scratch);
-
-		return true;
-	}
-	
-	double round_nearest(double value)
-	{
-		return floor(value + 0.5);
-	}
-
-	double round_nearest_nzero(double value)
-	{
-		// same as round_nearest, but returns -0 for [-0.5, -0]
-		// ceil is used to differentiate between +0 and -0 (we return -0 for [-0.5, -0] and +0 for +0)
-		return (value >= -0.5 && value <= 0) ? ceil(value) : floor(value + 0.5);
-	}
-	
-	const char_t* qualified_name(const xpath_node& node)
-	{
-		return node.attribute() ? node.attribute().name() : node.node().name();
-	}
-	
-	const char_t* local_name(const xpath_node& node)
-	{
-		const char_t* name = qualified_name(node);
-		const char_t* p = find_char(name, ':');
-		
-		return p ? p + 1 : name;
-	}
-
-	struct namespace_uri_predicate
-	{
-		const char_t* prefix;
-		size_t prefix_length;
-
-		namespace_uri_predicate(const char_t* name)
-		{
-			const char_t* pos = find_char(name, ':');
-
-			prefix = pos ? name : 0;
-			prefix_length = pos ? static_cast<size_t>(pos - name) : 0;
-		}
-
-		bool operator()(const xml_attribute& a) const
-		{
-			const char_t* name = a.name();
-
-			if (!starts_with(name, PUGIXML_TEXT("xmlns"))) return false;
-
-			return prefix ? name[5] == ':' && impl::strequalrange(name + 6, prefix, prefix_length) : name[5] == 0;
-		}
-	};
-
-	const char_t* namespace_uri(const xml_node& node)
-	{
-		namespace_uri_predicate pred = node.name();
-		
-		xml_node p = node;
-		
-		while (p)
-		{
-			xml_attribute a = p.find_attribute(pred);
-			
-			if (a) return a.value();
-			
-			p = p.parent();
-		}
-		
-		return PUGIXML_TEXT("");
-	}
-
-	const char_t* namespace_uri(const xml_attribute& attr, const xml_node& parent)
-	{
-		namespace_uri_predicate pred = attr.name();
-		
-		// Default namespace does not apply to attributes
-		if (!pred.prefix) return PUGIXML_TEXT("");
-		
-		xml_node p = parent;
-		
-		while (p)
-		{
-			xml_attribute a = p.find_attribute(pred);
-			
-			if (a) return a.value();
-			
-			p = p.parent();
-		}
-		
-		return PUGIXML_TEXT("");
-	}
-
-	const char_t* namespace_uri(const xpath_node& node)
-	{
-		return node.attribute() ? namespace_uri(node.attribute(), node.parent()) : namespace_uri(node.node());
-	}
-
-	void normalize_space(char_t* buffer)
-	{
-		char_t* write = buffer;
-
-		for (char_t* it = buffer; *it; )
-		{
-			char_t ch = *it++;
-
-			if (IS_CHARTYPEX(ch, ctx_space))
-			{
-				// replace whitespace sequence with single space
-				while (IS_CHARTYPEX(*it, ctx_space)) it++;
-
-				// avoid leading spaces
-				if (write != buffer) *write++ = ' ';
-			}
-			else *write++ = ch;
-		}
-
-		// remove trailing space
-		if (write != buffer && IS_CHARTYPEX(write[-1], ctx_space)) write--;
-
-		// zero-terminate
-		*write = 0;
-	}
-
-	void translate(char_t* buffer, const char_t* from, const char_t* to)
-	{
-		size_t to_length = impl::strlen(to);
-
-		char_t* write = buffer;
-
-		while (*buffer)
-		{
-		#ifdef __DMC__
-			volatile // explicitly store to local to work around DMC bug (it loads 4 bytes from buffer otherwise)
-		#endif
-			char_t ch = *buffer++;
-
-			const char_t* pos = find_char(from, ch);
-
-			if (!pos)
-				*write++ = ch; // do not process
-			else if (static_cast<size_t>(pos - from) < to_length)
-				*write++ = to[pos - from]; // replace
-		}
-
-		// zero-terminate
-		*write = 0;
-	}
-}
-
-namespace pugi
-{
-#ifndef PUGIXML_NO_EXCEPTIONS
-	xpath_exception::xpath_exception(const xpath_parse_result& result): _result(result)
-	{
-		assert(result.error);
-	}
-	
-	const char* xpath_exception::what() const throw()
-	{
-		return _result.error;
-	}
-
-	const xpath_parse_result& xpath_exception::result() const
-	{
-		return _result;
-	}
-#endif
-	
-	const size_t xpath_memory_block_size = 4096;
-
-	class xpath_allocator
-	{
-		struct memory_block
-		{	
-			memory_block* next;
-	
-			char data[xpath_memory_block_size];
-		};
-		
-		memory_block* _root;
-		size_t _root_size;
-
-		memory_block _first;
-		
-	public:
-		static xpath_allocator* create()
-		{
-			void* memory = get_memory_allocation_function()(sizeof(xpath_allocator));
-
-			return new (memory) xpath_allocator();
-		}
-
-		static void destroy(xpath_allocator* alloc)
-		{
-			if (!alloc) return;
-			
-			// free all allocated pages
-			memory_block* cur = alloc->_root;
-			memory_block* first = &alloc->_first;
-
-			while (cur != first)
-			{
-				memory_block* next = cur->next;
-
-				get_memory_deallocation_function()(cur);
-
-				cur = next;
-			}
-
-			// free allocator memory (with the first page)
-			get_memory_deallocation_function()(alloc);
-		}
-
-		xpath_allocator()
-		{
-			_root = &_first;
-			_root_size = 0;
-			_first.next = 0;
-		}
-		
-		void* allocate(size_t size)
-		{
-			// align size so that we're able to store pointers in subsequent blocks
-			size = (size + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
-
-			if (_root_size + size <= xpath_memory_block_size)
-			{
-				void* buf = _root->data + _root_size;
-				_root_size += size;
-				return buf;
-			}
-			else
-			{
-				size_t block_data_size = (size > xpath_memory_block_size) ? size : xpath_memory_block_size;
-				size_t block_size = block_data_size + offsetof(memory_block, data);
-
-				memory_block* block = static_cast<memory_block*>(get_memory_allocation_function()(block_size));
-				if (!block) return 0;
-				
-				block->next = _root;
-				
-				_root = block;
-				_root_size = size;
-				
-				return block->data;
-			}
-		}
-	};
-
-	xpath_node::xpath_node()
-	{
-	}
-		
-	xpath_node::xpath_node(const xml_node& node): _node(node)
-	{
-	}
-		
-	xpath_node::xpath_node(const xml_attribute& attribute, const xml_node& parent): _node(parent), _attribute(attribute)
-	{
-	}
-
-	xml_node xpath_node::node() const
-	{
-		return _attribute ? xml_node() : _node;
-	}
-		
-	xml_attribute xpath_node::attribute() const
-	{
-		return _attribute;
-	}
-	
-	xml_node xpath_node::parent() const
-	{
-		return _attribute ? _node : _node.parent();
-	}
-
-	xpath_node::operator xpath_node::unspecified_bool_type() const
-	{
-		return (_node || _attribute) ? &xpath_node::_node : 0;
-	}
-	
-	bool xpath_node::operator!() const
-	{
-		return !(_node || _attribute);
-	}
-
-	bool xpath_node::operator==(const xpath_node& n) const
-	{
-		return _node == n._node && _attribute == n._attribute;
-	}
-	
-	bool xpath_node::operator!=(const xpath_node& n) const
-	{
-		return _node != n._node || _attribute != n._attribute;
-	}
-
-#ifdef __BORLANDC__
-	bool operator&&(const xpath_node& lhs, bool rhs)
-	{
-		return (bool)lhs && rhs;
-	}
-
-	bool operator||(const xpath_node& lhs, bool rhs)
-	{
-		return (bool)lhs || rhs;
-	}
-#endif
-
-	xpath_node_set::xpath_node_set(): _type(type_unsorted), _begin(&_storage), _end(&_storage), _eos(&_storage + 1)
-	{
-	}
-
-	xpath_node_set::~xpath_node_set()
-	{
-		if (_begin != &_storage) get_memory_deallocation_function()(_begin);
-	}
-		
-	xpath_node_set::xpath_node_set(const xpath_node_set& ns): _type(ns._type), _begin(&_storage), _end(&_storage), _eos(&_storage + 1)
-	{
-		if (ns.size() == 1)
-		{
-			_storage = *ns._begin;
-			_end = _eos;
-		}
-		else
-		{
-			append(ns.begin(), ns.end());
-		}
-	}
-	
-	xpath_node_set& xpath_node_set::operator=(const xpath_node_set& ns)
-	{
-		if (this == &ns) return *this;
-		
-		// clear & append
-		_type = ns._type;
-		_end = _begin;
-		
-		append(ns.begin(), ns.end());
-		
-		return *this;
-	}
-
-	void xpath_node_set::swap(xpath_node_set& ns)
-	{
-		pstd::swap(_type, ns._type);
-		pstd::swap(_storage, ns._storage);
-		pstd::swap(_begin, ns._begin);
-		pstd::swap(_end, ns._end);
-		pstd::swap(_eos, ns._eos);
-	}
-
-	xpath_node_set::type_t xpath_node_set::type() const
-	{
-		return _type;
-	}
-		
-	size_t xpath_node_set::size() const
-	{
-		return _end - _begin;
-	}
-		
-	bool xpath_node_set::empty() const
-	{
-		return size() == 0;
-	}
-		
-	const xpath_node& xpath_node_set::operator[](size_t index) const
-	{
-		assert(index < size());
-		return _begin[index];
-	}
-
-	xpath_node_set::iterator xpath_node_set::mut_begin()
-	{
-		return _begin;
-	}
-	
-	xpath_node_set::const_iterator xpath_node_set::begin() const
-	{
-		return _begin;
-	}
-		
-	xpath_node_set::const_iterator xpath_node_set::end() const
-	{
-		return _end;
-	}
-	
-	void xpath_node_set::sort(bool reverse)
-	{
-		pstd::sort(_begin, _end, document_order_comparator());
-		
-		if (reverse) pstd::reverse(_begin, _end);
-			
-		_type = reverse ? type_sorted_reverse : type_sorted;
-	}
-
-	void xpath_node_set::push_back(const xpath_node& n)
-	{
-		if (_end == _eos)
-			append(&n, &n + 1);
-		else
-		{
-			*_end = n;
-			++_end;
-		}
-	}
-
-	void xpath_node_set::append(const_iterator begin, const_iterator end)
-	{
-		if (begin == end) return;
-
-		size_t count = end - begin;
-		size_t size = _end - _begin;
-		size_t capacity = _eos - _begin;
-		
-		if (capacity < size + count)
-		{
-			if (capacity < 2) capacity = 2;
-			
-			while (capacity < size + count) capacity += capacity / 2;
-			
-			xpath_node* storage = static_cast<xpath_node*>(get_memory_allocation_function()(capacity * sizeof(xpath_node)));
-			if (!storage) return; // $$ out of memory
-
-			pstd::copy(_begin, _end, storage);
-			// memcpy(storage, _begin, size * sizeof(xpath_node));
-			
-			if (_begin != &_storage) get_memory_deallocation_function()(_begin);
-			
-			_begin = storage;
-			_end = storage + size;
-			_eos = storage + capacity;
-		}
-		
-		pstd::copy(begin, end, _end);
-		// memcpy(_end, begin, count * sizeof(xpath_node));
-		_end += count;
-	}
-
-	void xpath_node_set::truncate(iterator it)
-	{
-		_end = it;
-	}
-
-	xpath_node xpath_node_set::first() const
-	{
-		if (empty()) return xpath_node();
-
-		switch (_type)
-		{
-		case type_sorted: return *_begin;
-		case type_sorted_reverse: return *(_end - 1);
-		case type_unsorted: return *pstd::min_element(_begin, _end, document_order_comparator());
-		default: return xpath_node();
-		}
-	}
-
-	void xpath_node_set::remove_duplicates()
-	{
-		if (_type == type_unsorted)
-		{
-			pstd::sort(_begin, _end, duplicate_comparator());
-		}
-		
-		truncate(pstd::unique(_begin, _end));
-	}
-
-	struct xpath_context
-	{
-		xpath_node n;
-		size_t position, size;
-
-		xpath_context(const xpath_node& n, size_t position, size_t size): n(n), position(position), size(size)
-		{
-		}
-	};
-
-	enum lexeme_t
-	{
-		lex_none = 0,
-		lex_equal,
-		lex_not_equal,
-		lex_less,
-		lex_greater,
-		lex_less_or_equal,
-		lex_greater_or_equal,
-		lex_plus,
-		lex_minus,
-		lex_multiply,
-		lex_union,
-		lex_var_ref,
-		lex_open_brace,
-		lex_close_brace,
-		lex_quoted_string,
-		lex_number,
-		lex_slash,
-		lex_double_slash,
-		lex_open_square_brace,
-		lex_close_square_brace,
-		lex_string,
-		lex_comma,
-		lex_axis_attribute,
-		lex_dot,
-		lex_double_dot,
-		lex_double_colon,
-		lex_eof
-	};
-
-	struct xpath_lexer_string
-	{
-		const char_t* begin;
-		const char_t* end;
-
-		xpath_lexer_string(): begin(0), end(0)
-		{
-		}
-
-		bool operator==(const char_t* other) const
-		{
-			size_t length = static_cast<size_t>(end - begin);
-
-			return impl::strequalrange(other, begin, length);
-		}
-	};
-
-	class xpath_lexer
-	{
-		const char_t* _cur;
-		const char_t* _cur_lexeme_pos;
-		xpath_lexer_string _cur_lexeme_contents;
-
-		lexeme_t _cur_lexeme;
-
-	public:
-		explicit xpath_lexer(const char_t* query): _cur(query)
-		{
-			next();
-		}
-		
-		const char_t* state() const
-		{
-			return _cur;
-		}
-		
-		void next()
-		{
-			const char_t* cur = _cur;
-
-			while (IS_CHARTYPEX(*cur, ctx_space)) ++cur;
-
-			// save lexeme position for error reporting
-			_cur_lexeme_pos = cur;
-
-			switch (*cur)
-			{
-			case 0:
-				_cur_lexeme = lex_eof;
-				break;
-			
-			case '>':
-				if (*(cur+1) == '=')
-				{
-					cur += 2;
-					_cur_lexeme = lex_greater_or_equal;
-				}
-				else
-				{
-					cur += 1;
-					_cur_lexeme = lex_greater;
-				}
-				break;
-
-			case '<':
-				if (*(cur+1) == '=')
-				{
-					cur += 2;
-					_cur_lexeme = lex_less_or_equal;
-				}
-				else
-				{
-					cur += 1;
-					_cur_lexeme = lex_less;
-				}
-				break;
-
-			case '!':
-				if (*(cur+1) == '=')
-				{
-					cur += 2;
-					_cur_lexeme = lex_not_equal;
-				}
-				else
-				{
-					_cur_lexeme = lex_none;
-				}
-				break;
-
-			case '=':
-				cur += 1;
-				_cur_lexeme = lex_equal;
-
-				break;
-			
-			case '+':
-				cur += 1;
-				_cur_lexeme = lex_plus;
-
-				break;
-
-			case '-':
-				cur += 1;
-				_cur_lexeme = lex_minus;
-
-				break;
-
-			case '*':
-				cur += 1;
-				_cur_lexeme = lex_multiply;
-
-				break;
-
-			case '|':
-				cur += 1;
-				_cur_lexeme = lex_union;
-
-				break;
-
-			case '$':
-				cur += 1;
-				_cur_lexeme = lex_var_ref;
-
-				break;
-			
-			case '(':
-				cur += 1;
-				_cur_lexeme = lex_open_brace;
-
-				break;
-
-			case ')':
-				cur += 1;
-				_cur_lexeme = lex_close_brace;
-
-				break;
-			
-			case '[':
-				cur += 1;
-				_cur_lexeme = lex_open_square_brace;
-
-				break;
-
-			case ']':
-				cur += 1;
-				_cur_lexeme = lex_close_square_brace;
-
-				break;
-
-			case ',':
-				cur += 1;
-				_cur_lexeme = lex_comma;
-
-				break;
-
-			case '/':
-				if (*(cur+1) == '/')
-				{
-					cur += 2;
-					_cur_lexeme = lex_double_slash;
-				}
-				else
-				{
-					cur += 1;
-					_cur_lexeme = lex_slash;
-				}
-				break;
-		
-			case '.':
-				if (*(cur+1) == '.')
-				{
-					cur += 2;
-					_cur_lexeme = lex_double_dot;
-				}
-				else if (IS_CHARTYPEX(*(cur+1), ctx_digit))
-				{
-					_cur_lexeme_contents.begin = cur; // .
-
-					++cur;
-
-					while (IS_CHARTYPEX(*cur, ctx_digit)) cur++;
-
-					_cur_lexeme_contents.end = cur;
-					
-					_cur_lexeme = lex_number;
-				}
-				else
-				{
-					cur += 1;
-					_cur_lexeme = lex_dot;
-				}
-				break;
-
-			case '@':
-				cur += 1;
-				_cur_lexeme = lex_axis_attribute;
-
-				break;
-
-			case '"':
-			case '\'':
-			{
-				char_t terminator = *cur;
-
-				++cur;
-
-				_cur_lexeme_contents.begin = cur;
-				while (*cur && *cur != terminator) cur++;
-				_cur_lexeme_contents.end = cur;
-				
-				if (!*cur)
-					_cur_lexeme = lex_none;
-				else
-				{
-					cur += 1;
-					_cur_lexeme = lex_quoted_string;
-				}
-
-				break;
-			}
-
-			case ':':
-				if (*(cur+1) == ':')
-				{
-					cur += 2;
-					_cur_lexeme = lex_double_colon;
-				}
-				else
-				{
-					_cur_lexeme = lex_none;
-				}
-				break;
-
-			default:
-				if (IS_CHARTYPEX(*cur, ctx_digit))
-				{
-					_cur_lexeme_contents.begin = cur;
-
-					while (IS_CHARTYPEX(*cur, ctx_digit)) cur++;
-				
-					if (*cur == '.')
-					{
-						cur++;
-
-						while (IS_CHARTYPEX(*cur, ctx_digit)) cur++;
-					}
-
-					_cur_lexeme_contents.end = cur;
-
-					_cur_lexeme = lex_number;
-				}
-				else if (IS_CHARTYPEX(*cur, ctx_start_symbol))
-				{
-					_cur_lexeme_contents.begin = cur;
-
-					while (IS_CHARTYPEX(*cur, ctx_symbol)) cur++;
-
-					if (cur[0] == ':')
-					{
-						if (cur[1] == '*') // namespace test ncname:*
-						{
-							cur += 2; // :*
-						}
-						else if (IS_CHARTYPEX(cur[1], ctx_symbol)) // namespace test qname
-						{
-							cur++; // :
-
-							while (IS_CHARTYPEX(*cur, ctx_symbol)) cur++;
-						}
-					}
-
-					_cur_lexeme_contents.end = cur;
-				
-					_cur_lexeme = lex_string;
-				}
-				else
-				{
-					_cur_lexeme = lex_none;
-				}
-			}
-
-			_cur = cur;
-		}
-
-		lexeme_t current() const
-		{
-			return _cur_lexeme;
-		}
-
-		const char_t* current_pos() const
-		{
-			return _cur_lexeme_pos;
-		}
-
-		const xpath_lexer_string& contents() const
-		{
-			assert(_cur_lexeme == lex_number || _cur_lexeme == lex_string || _cur_lexeme == lex_quoted_string);
-
-			return _cur_lexeme_contents;
-		}
-	};
-
-	enum ast_type_t
-	{
-		ast_op_or,						// left or right
-		ast_op_and,						// left and right
-		ast_op_equal,					// left = right
-		ast_op_not_equal, 				// left != right
-		ast_op_less,					// left < right
-		ast_op_greater,					// left > right
-		ast_op_less_or_equal,			// left <= right
-		ast_op_greater_or_equal,		// left >= right
-		ast_op_add,						// left + right
-		ast_op_subtract,				// left - right
-		ast_op_multiply,				// left * right
-		ast_op_divide,					// left / right
-		ast_op_mod,						// left % right
-		ast_op_negate,					// left - right
-		ast_op_union,					// left | right
-		ast_predicate,					// apply predicate to set; next points to next predicate
-		ast_filter,						// select * from left where right
-		ast_filter_posinv,				// select * from left where right; proximity position invariant
-		ast_string_constant,			// string constant
-		ast_number_constant,			// number constant
-		ast_func_last,					// last()
-		ast_func_position,				// position()
-		ast_func_count,					// count(left)
-		ast_func_id,					// id(left)
-		ast_func_local_name_0,			// local-name()
-		ast_func_local_name_1,			// local-name(left)
-		ast_func_namespace_uri_0,		// namespace-uri()
-		ast_func_namespace_uri_1,		// namespace-uri(left)
-		ast_func_name_0,				// name()
-		ast_func_name_1,				// name(left)
-		ast_func_string_0,				// string()
-		ast_func_string_1,				// string(left)
-		ast_func_concat,				// concat(left, right, siblings)
-		ast_func_starts_with,			// starts_with(left, right)
-		ast_func_contains,				// contains(left, right)
-		ast_func_substring_before,		// substring-before(left, right)
-		ast_func_substring_after,		// substring-after(left, right)
-		ast_func_substring_2,			// substring(left, right)
-		ast_func_substring_3,			// substring(left, right, third)
-		ast_func_string_length_0,		// string-length()
-		ast_func_string_length_1,		// string-length(left)
-		ast_func_normalize_space_0,		// normalize-space()
-		ast_func_normalize_space_1,		// normalize-space(left)
-		ast_func_translate,				// translate(left, right, third)
-		ast_func_boolean,				// boolean(left)
-		ast_func_not,					// not(left)
-		ast_func_true,					// true()
-		ast_func_false,					// false()
-		ast_func_lang,					// lang(left)
-		ast_func_number_0,				// number()
-		ast_func_number_1,				// number(left)
-		ast_func_sum,					// sum(left)
-		ast_func_floor,					// floor(left)
-		ast_func_ceiling,				// ceiling(left)
-		ast_func_round,					// round(left)
-		ast_step,						// process set left with step
-		ast_step_root					// select root node
-	};
-
-	enum axis_t
-	{
-		axis_ancestor,
-		axis_ancestor_or_self,
-		axis_attribute,
-		axis_child,
-		axis_descendant,
-		axis_descendant_or_self,
-		axis_following,
-		axis_following_sibling,
-		axis_namespace,
-		axis_parent,
-		axis_preceding,
-		axis_preceding_sibling,
-		axis_self
-	};
-	
-	enum nodetest_t
-	{
-		nodetest_none,
-		nodetest_name,
-		nodetest_type_node,
-		nodetest_type_comment,
-		nodetest_type_pi,
-		nodetest_type_text,
-		nodetest_pi,
-		nodetest_all,
-		nodetest_all_in_namespace
-	};
-
-	template <axis_t N> struct axis_to_type
-	{
-		static const axis_t axis;
-	};
-
-	template <axis_t N> const axis_t axis_to_type<N>::axis = N;
-		
-	class xpath_ast_node
-	{
-	private:
-		// node type
-		char _type;
-		char _rettype;
-
-		// for ast_step / ast_predicate
-		char _axis;
-		char _test;
-
-		// tree node structure
-		xpath_ast_node* _left;
-		xpath_ast_node* _right;
-		xpath_ast_node* _next;
-
-		union
-		{
-			// value for ast_string_constant
-			const char_t* string;
-			// value for ast_number_constant
-			double number;
-			// node test for ast_step (node name/namespace/node type/pi target)
-			const char_t* nodetest;
-		} _data;
-
-		xpath_ast_node(const xpath_ast_node&);
-		xpath_ast_node& operator=(const xpath_ast_node&);
-
-		template <class Comp> static bool compare_eq(xpath_ast_node* lhs, xpath_ast_node* rhs, const xpath_context& c, const Comp& comp)
-		{
-			xpath_value_type lt = lhs->rettype(), rt = rhs->rettype();
-
-			if (lt != xpath_type_node_set && rt != xpath_type_node_set)
-			{
-				if (lt == xpath_type_boolean || rt == xpath_type_boolean)
-					return comp(lhs->eval_boolean(c), rhs->eval_boolean(c));
-				else if (lt == xpath_type_number || rt == xpath_type_number)
-					return comp(lhs->eval_number(c), rhs->eval_number(c));
-				else if (lt == xpath_type_string || rt == xpath_type_string)
-					return comp(lhs->eval_string(c), rhs->eval_string(c));
-			}
-			else if (lt == xpath_type_node_set && rt == xpath_type_node_set)
-			{
-				xpath_node_set ls = lhs->eval_node_set(c);
-				xpath_node_set rs = rhs->eval_node_set(c);
-
-				for (xpath_node_set::const_iterator li = ls.begin(); li != ls.end(); ++li)
-					for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri)
-					{
-						if (comp(string_value(*li), string_value(*ri)))
-							return true;
-					}
-
-				return false;
-			}
-			else
-			{
-				if (lt == xpath_type_node_set)
-				{
-					pstd::swap(lhs, rhs);
-					pstd::swap(lt, rt);
-				}
-
-				if (lt == xpath_type_boolean)
-					return comp(lhs->eval_boolean(c), rhs->eval_boolean(c));
-				else if (lt == xpath_type_number)
-				{
-					double l = lhs->eval_number(c);
-					xpath_node_set rs = rhs->eval_node_set(c);
-
-					for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri)
-					{
-						if (comp(l, convert_string_to_number(string_value(*ri).c_str())))
-							return true;
-					}
-
-					return false;
-				}
-				else if (lt == xpath_type_string)
-				{
-					xpath_string l = lhs->eval_string(c);
-					xpath_node_set rs = rhs->eval_node_set(c);
-
-					for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri)
-					{
-						if (comp(l, string_value(*ri)))
-							return true;
-					}
-
-					return false;
-				}
-			}
-
-			assert(!"Wrong types");
-			return false;
-		}
-
-		template <class Comp> static bool compare_rel(xpath_ast_node* lhs, xpath_ast_node* rhs, const xpath_context& c, const Comp& comp)
-		{
-			xpath_value_type lt = lhs->rettype(), rt = rhs->rettype();
-
-			if (lt != xpath_type_node_set && rt != xpath_type_node_set)
-				return comp(lhs->eval_number(c), rhs->eval_number(c));
-			else if (lt == xpath_type_node_set && rt == xpath_type_node_set)
-			{
-				xpath_node_set ls = lhs->eval_node_set(c);
-				xpath_node_set rs = rhs->eval_node_set(c);
-
-				for (xpath_node_set::const_iterator li = ls.begin(); li != ls.end(); ++li)
-				{
-					double l = convert_string_to_number(string_value(*li).c_str());
-
-					for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri)
-					{
-						if (comp(l, convert_string_to_number(string_value(*ri).c_str())))
-							return true;
-					}
-				}
-
-				return false;
-			}
-			else if (lt != xpath_type_node_set && rt == xpath_type_node_set)
-			{
-				double l = lhs->eval_number(c);
-				xpath_node_set rs = rhs->eval_node_set(c);
-
-				for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri)
-				{
-					if (comp(l, convert_string_to_number(string_value(*ri).c_str())))
-						return true;
-				}
-
-				return false;
-			}
-			else if (lt == xpath_type_node_set && rt != xpath_type_node_set)
-			{
-				xpath_node_set ls = lhs->eval_node_set(c);
-				double r = rhs->eval_number(c);
-
-				for (xpath_node_set::const_iterator li = ls.begin(); li != ls.end(); ++li)
-				{
-					if (comp(convert_string_to_number(string_value(*li).c_str()), r))
-						return true;
-				}
-
-				return false;
-			}
-			else
-			{
-				assert(!"Wrong types");
-				return false;
-			}
-		}
-
-		void apply_predicate(xpath_node_set& ns, size_t first, xpath_ast_node* expr)
-		{
-			assert(ns.size() >= first);
-
-			size_t i = 1;
-			size_t size = ns.size() - first;
-				
-			xpath_node_set::iterator last = ns.mut_begin() + first;
-				
-			// remove_if... or well, sort of
-			for (xpath_node_set::iterator it = last; it != ns.end(); ++it, ++i)
-			{
-				xpath_context c(*it, i, size);
-			
-				if (expr->rettype() == xpath_type_number)
-				{
-					if (expr->eval_number(c) == i)
-						*last++ = *it;
-				}
-				else if (expr->eval_boolean(c))
-					*last++ = *it;
-			}
-			
-			ns.truncate(last);
-		}
-
-		void apply_predicates(xpath_node_set& ns, size_t first)
-		{
-			if (ns.size() == first) return;
-			
-			for (xpath_ast_node* pred = _right; pred; pred = pred->_next)
-			{
-				apply_predicate(ns, first, pred->_left);
-			}
-		}
-
-		void step_push(xpath_node_set& ns, const xml_attribute& a, const xml_node& parent)
-		{
-			if (!a) return;
-
-			const char_t* name = a.name();
-
-			// There are no attribute nodes corresponding to attributes that declare namespaces
-			// That is, "xmlns:..." or "xmlns"
-			if (starts_with(name, PUGIXML_TEXT("xmlns")) && (name[5] == 0 || name[5] == ':')) return;
-			
-			switch (_test)
-			{
-			case nodetest_name:
-				if (impl::strequal(name, _data.nodetest)) ns.push_back(xpath_node(a, parent));
-				break;
-				
-			case nodetest_type_node:
-			case nodetest_all:
-				ns.push_back(xpath_node(a, parent));
-				break;
-				
-			case nodetest_all_in_namespace:
-				if (starts_with(name, _data.nodetest))
-					ns.push_back(xpath_node(a, parent));
-				break;
-			
-			default:
-				;
-			}
-		}
-		
-		void step_push(xpath_node_set& ns, const xml_node& n)
-		{
-			if (!n) return;
-
-			switch (_test)
-			{
-			case nodetest_name:
-				if (n.type() == node_element && impl::strequal(n.name(), _data.nodetest)) ns.push_back(n);
-				break;
-				
-			case nodetest_type_node:
-				ns.push_back(n);
-				break;
-				
-			case nodetest_type_comment:
-				if (n.type() == node_comment)
-					ns.push_back(n);
-				break;
-				
-			case nodetest_type_text:
-				if (n.type() == node_pcdata || n.type() == node_cdata)
-					ns.push_back(n);
-				break;
-				
-			case nodetest_type_pi:
-				if (n.type() == node_pi)
-					ns.push_back(n);
-				break;
-									
-			case nodetest_pi:
-				if (n.type() == node_pi && impl::strequal(n.name(), _data.nodetest))
-					ns.push_back(n);
-				break;
-				
-			case nodetest_all:
-				if (n.type() == node_element)
-					ns.push_back(n);
-				break;
-				
-			case nodetest_all_in_namespace:
-				if (n.type() == node_element && starts_with(n.name(), _data.nodetest))
-					ns.push_back(n);
-				break;
-
-			default:
-				assert(!"Unknown axis");
-			} 
-		}
-
-		template <class T> void step_fill(xpath_node_set& ns, const xml_node& n, T)
-		{
-			const axis_t axis = T::axis;
-
-			switch (axis)
-			{
-			case axis_attribute:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
-				
-				for (xml_attribute a = n.first_attribute(); a; a = a.next_attribute())
-					step_push(ns, a, n);
-				
-				break;
-			}
-			
-			case axis_child:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
-
-				for (xml_node c = n.first_child(); c; c = c.next_sibling())
-					step_push(ns, c);
-					
-				break;
-			}
-			
-			case axis_descendant:
-			case axis_descendant_or_self:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
-				
-				if (axis == axis_descendant_or_self)
-					step_push(ns, n);
-					
-				xml_node cur = n.first_child();
-				
-				while (cur && cur != n)
-				{
-					step_push(ns, cur);
-					
-					if (cur.first_child())
-						cur = cur.first_child();
-					else if (cur.next_sibling())
-						cur = cur.next_sibling();
-					else
-					{
-						while (!cur.next_sibling() && cur != n)
-							cur = cur.parent();
-					
-						if (cur != n) cur = cur.next_sibling();
-					}
-				}
-				
-				break;
-			}
-			
-			case axis_following_sibling:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
-
-				for (xml_node c = n.next_sibling(); c; c = c.next_sibling())
-					step_push(ns, c);
-				
-				break;
-			}
-			
-			case axis_preceding_sibling:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted;
-
-				for (xml_node c = n.previous_sibling(); c; c = c.previous_sibling())
-					step_push(ns, c);
-				
-				break;
-			}
-			
-			case axis_following:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
-
-				xml_node cur = n;
-
-				// exit from this node so that we don't include descendants
-				while (cur && !cur.next_sibling()) cur = cur.parent();
-				cur = cur.next_sibling();
-
-				for (;;)
-				{
-					step_push(ns, cur);
-
-					if (cur.first_child())
-						cur = cur.first_child();
-					else if (cur.next_sibling())
-						cur = cur.next_sibling();
-					else
-					{
-						while (cur && !cur.next_sibling()) cur = cur.parent();
-						cur = cur.next_sibling();
-
-						if (!cur) break;
-					}
-				}
-
-				break;
-			}
-
-			case axis_preceding:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted;
-
-				xml_node cur = n;
-
-				while (cur && !cur.previous_sibling()) cur = cur.parent();
-				cur = cur.previous_sibling();
-
-				for (;;)
-				{
-					if (cur.last_child())
-						cur = cur.last_child();
-					else
-					{
-						// leaf node, can't be ancestor
-						step_push(ns, cur);
-
-						if (cur.previous_sibling())
-							cur = cur.previous_sibling();
-						else
-						{
-							do 
-							{
-								cur = cur.parent();
-								if (!cur) break;
-
-								if (!node_is_ancestor(cur, n)) step_push(ns, cur);
-							}
-							while (!cur.previous_sibling());
-
-							cur = cur.previous_sibling();
-
-							if (!cur) break;
-						}
-					}
-				}
-
-				break;
-			}
-			
-			case axis_ancestor:
-			case axis_ancestor_or_self:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted;
-
-				if (axis == axis_ancestor_or_self)
-					step_push(ns, n);
-
-				xml_node cur = n.parent();
-				
-				while (cur)
-				{
-					step_push(ns, cur);
-					
-					cur = cur.parent();
-				}
-				
-				break;
-			}
-
-			case axis_self:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
-
-				step_push(ns, n);
-
-				break;
-			}
-
-			case axis_parent:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
-
-				if (n.parent()) step_push(ns, n.parent());
-
-				break;
-			}
-				
-			default:
-				assert(!"Unimplemented axis");
-			}
-		}
-		
-		template <class T> void step_fill(xpath_node_set& ns, const xml_attribute& a, const xml_node& p, T v)
-		{
-			const axis_t axis = T::axis;
-
-			switch (axis)
-			{
-			case axis_ancestor:
-			case axis_ancestor_or_self:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted;
-
-				if (axis == axis_ancestor_or_self && _test == nodetest_type_node) // reject attributes based on principal node type test
-					step_push(ns, a, p);
-
-				xml_node cur = p;
-				
-				while (cur)
-				{
-					step_push(ns, cur);
-					
-					cur = cur.parent();
-				}
-				
-				break;
-			}
-
-			case axis_descendant_or_self:
-			case axis_self:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
-
-				if (_test == nodetest_type_node) // reject attributes based on principal node type test
-					step_push(ns, a, p);
-
-				break;
-			}
-
-			case axis_following:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
-				
-				xml_node cur = p;
-				
-				for (;;)
-				{
-					if (cur.first_child())
-						cur = cur.first_child();
-					else if (cur.next_sibling())
-						cur = cur.next_sibling();
-					else
-					{
-						while (cur && !cur.next_sibling()) cur = cur.parent();
-						cur = cur.next_sibling();
-						
-						if (!cur) break;
-					}
-
-					step_push(ns, cur);
-				}
-
-				break;
-			}
-
-			case axis_parent:
-			{
-				ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted;
-
-				step_push(ns, p);
-
-				break;
-			}
-
-			case axis_preceding:
-			{
-				// preceding:: axis does not include attribute nodes and attribute ancestors (they are the same as parent's ancestors), so we can reuse node preceding
-				step_fill(ns, p, v);
-				break;
-			}
-			
-			default:
-				assert(!"Unimplemented axis");
-			}
-		}
-		
-		template <class T> void step_do(xpath_node_set& ns, const xpath_context& c, T v)
-		{
-			const axis_t axis = T::axis;
-
-			assert(ns.empty());
-
-			switch (axis)
-			{
-			case axis_ancestor:
-			case axis_ancestor_or_self:
-			case axis_descendant_or_self:
-			case axis_following:
-			case axis_parent:
-			case axis_preceding:
-			case axis_self:
-				if (_left)
-				{
-					xpath_node_set s = _left->eval_node_set(c);
-							
-					for (xpath_node_set::const_iterator it = s.begin(); it != s.end(); ++it)
-					{
-						size_t size = ns.size();
-						
-						if (it->node())
-							step_fill(ns, it->node(), v);
-						else
-							step_fill(ns, it->attribute(), it->parent(), v);
-							
-						apply_predicates(ns, size);
-					}
-				}
-				else
-				{
-					if (c.n.node()) step_fill(ns, c.n.node(), v);
-					else step_fill(ns, c.n.attribute(), c.n.parent(), v);
-					
-					apply_predicates(ns, 0);
-				}
-				
-				break;
-		
-			case axis_following_sibling:
-			case axis_preceding_sibling:
-			case axis_attribute:
-			case axis_child:
-			case axis_descendant:
-				if (_left)
-				{
-					xpath_node_set s = _left->eval_node_set(c);
-					
-					for (xpath_node_set::const_iterator it = s.begin(); it != s.end(); ++it)
-					{
-						size_t size = ns.size();
-						
-						if (it->node())
-							step_fill(ns, it->node(), v);
-						
-						apply_predicates(ns, size);
-					}
-				}
-				else if (c.n.node())
-				{
-					step_fill(ns, c.n.node(), v);
-					
-					apply_predicates(ns, 0);
-				}
-				
-				break;
-			
-			case axis_namespace:
-				break;
-				
-			default:
-				assert(!"Unimplemented axis");
-			}
-		}
-		
-	public:
-		xpath_ast_node(ast_type_t type, xpath_value_type rettype, const char_t* value):
-			_type((char)type), _rettype((char)rettype), _axis(0), _test(0), _left(0), _right(0), _next(0)
-		{
-			assert(type == ast_string_constant);
-			_data.string = value;
-		}
-
-		xpath_ast_node(ast_type_t type, xpath_value_type rettype, double value):
-			_type((char)type), _rettype((char)rettype), _axis(0), _test(0), _left(0), _right(0), _next(0)
-		{
-			assert(type == ast_number_constant);
-			_data.number = value;
-		}
-		
-		xpath_ast_node(ast_type_t type, xpath_value_type rettype, xpath_ast_node* left = 0, xpath_ast_node* right = 0):
-			_type((char)type), _rettype((char)rettype), _axis(0), _test(0), _left(left), _right(right), _next(0)
-		{
-		}
-
-		xpath_ast_node(ast_type_t type, xpath_ast_node* left, axis_t axis, nodetest_t test, const char_t* contents):
-			_type((char)type), _rettype(xpath_type_node_set), _axis((char)axis), _test((char)test), _left(left), _right(0), _next(0)
-		{
-			_data.nodetest = contents;
-		}
-
-		void set_next(xpath_ast_node* value)
-		{
-			_next = value;
-		}
-
-		void set_right(xpath_ast_node* value)
-		{
-			_right = value;
-		}
-
-		bool eval_boolean(const xpath_context& c)
-		{
-			switch (_type)
-			{
-			case ast_op_or:
-				if (_left->eval_boolean(c)) return true;
-				else return _right->eval_boolean(c);
-				
-			case ast_op_and:
-				if (!_left->eval_boolean(c)) return false;
-				else return _right->eval_boolean(c);
-				
-			case ast_op_equal:
-				return compare_eq(_left, _right, c, pstd::equal_to());
-
-			case ast_op_not_equal:
-				return compare_eq(_left, _right, c, pstd::not_equal_to());
-	
-			case ast_op_less:
-				return compare_rel(_left, _right, c, pstd::less());
-			
-			case ast_op_greater:
-				return compare_rel(_right, _left, c, pstd::less());
-
-			case ast_op_less_or_equal:
-				return compare_rel(_left, _right, c, pstd::less_equal());
-			
-			case ast_op_greater_or_equal:
-				return compare_rel(_right, _left, c, pstd::less_equal());
-
-			case ast_func_starts_with:
-				return starts_with(_left->eval_string(c).c_str(), _right->eval_string(c).c_str());
-
-			case ast_func_contains:
-			{
-				xpath_string lr = _left->eval_string(c);
-				xpath_string rr = _right->eval_string(c);
-
-				return find_substring(lr.c_str(), rr.c_str()) != 0;
-			}
-
-			case ast_func_boolean:
-				return _left->eval_boolean(c);
-				
-			case ast_func_not:
-				return !_left->eval_boolean(c);
-				
-			case ast_func_true:
-				return true;
-				
-			case ast_func_false:
-				return false;
-
-			case ast_func_lang:
-			{
-				if (c.n.attribute()) return false;
-				
-				xpath_string lang = _left->eval_string(c);
-				
-				for (xml_node n = c.n.node(); n; n = n.parent())
-				{
-					xml_attribute a = n.attribute(PUGIXML_TEXT("xml:lang"));
-					
-					if (a)
-					{
-						const char_t* value = a.value();
-						
-						// strnicmp / strncasecmp is not portable
-						for (const char_t* lit = lang.c_str(); *lit; ++lit)
-						{
-							if (tolower(*lit) != tolower(*value)) return false;
-							++value;
-						}
-						
-						return *value == 0 || *value == '-';
-					}
-				}
-				
-				return false;
-			}
-
-			default:
-			{
-				switch (_rettype)
-				{
-				case xpath_type_number:
-					return convert_number_to_boolean(eval_number(c));
-					
-				case xpath_type_string:
-					return !eval_string(c).empty();
-					
-				case xpath_type_node_set:				
-					return !eval_node_set(c).empty();
-					
-				default:
-					assert(!"Wrong expression for return type boolean");
-					return false;
-				}
-			}
-			}
-		}
-
-		double eval_number(const xpath_context& c)
-		{
-			switch (_type)
-			{
-			case ast_op_add:
-				return _left->eval_number(c) + _right->eval_number(c);
-				
-			case ast_op_subtract:
-				return _left->eval_number(c) - _right->eval_number(c);
-
-			case ast_op_multiply:
-				return _left->eval_number(c) * _right->eval_number(c);
-
-			case ast_op_divide:
-				return _left->eval_number(c) / _right->eval_number(c);
-
-			case ast_op_mod:
-				return fmod(_left->eval_number(c), _right->eval_number(c));
-
-			case ast_op_negate:
-				return -_left->eval_number(c);
-
-			case ast_number_constant:
-				return _data.number;
-
-			case ast_func_last:
-				return (double)c.size;
-			
-			case ast_func_position:
-				return (double)c.position;
-
-			case ast_func_count:
-				return (double)_left->eval_node_set(c).size();
-			
-			case ast_func_string_length_0:
-				return (double)string_value(c.n).length();
-			
-			case ast_func_string_length_1:
-				return (double)_left->eval_string(c).length();
-			
-			case ast_func_number_0:
-				return convert_string_to_number(string_value(c.n).c_str());
-			
-			case ast_func_number_1:
-				return _left->eval_number(c);
-
-			case ast_func_sum:
-			{
-				double r = 0;
-				
-				xpath_node_set ns = _left->eval_node_set(c);
-				
-				for (xpath_node_set::const_iterator it = ns.begin(); it != ns.end(); ++it)
-					r += convert_string_to_number(string_value(*it).c_str());
-			
-				return r;
-			}
-
-			case ast_func_floor:
-			{
-				double r = _left->eval_number(c);
-				
-				return r == r ? floor(r) : r;
-			}
-
-			case ast_func_ceiling:
-			{
-				double r = _left->eval_number(c);
-				
-				return r == r ? ceil(r) : r;
-			}
-
-			case ast_func_round:
-				return round_nearest_nzero(_left->eval_number(c));
-			
-			default:
-			{
-				switch (_rettype)
-				{
-				case xpath_type_boolean:
-					return eval_boolean(c) ? 1 : 0;
-					
-				case xpath_type_string:
-					return convert_string_to_number(eval_string(c).c_str());
-					
-				case xpath_type_node_set:
-					return convert_string_to_number(eval_string(c).c_str());
-					
-				default:
-					assert(!"Wrong expression for return type number");
-					return 0;
-				}
-				
-			}
-			}
-		}
-		
-		xpath_string eval_string(const xpath_context& c)
-		{
-			switch (_type)
-			{
-			case ast_string_constant:
-				return xpath_string_const(_data.string);
-			
-			case ast_func_local_name_0:
-			{
-				xpath_node na = c.n;
-				
-				return xpath_string_const(local_name(na));
-			}
-
-			case ast_func_local_name_1:
-			{
-				xpath_node_set ns = _left->eval_node_set(c);
-				xpath_node na = ns.first();
-				
-				return xpath_string_const(local_name(na));
-			}
-
-			case ast_func_name_0:
-			{
-				xpath_node na = c.n;
-				
-				return xpath_string_const(qualified_name(na));
-			}
-
-			case ast_func_name_1:
-			{
-				xpath_node_set ns = _left->eval_node_set(c);
-				xpath_node na = ns.first();
-				
-				return xpath_string_const(qualified_name(na));
-			}
-
-			case ast_func_namespace_uri_0:
-			{
-				xpath_node na = c.n;
-				
-				return xpath_string_const(namespace_uri(na));
-			}
-
-			case ast_func_namespace_uri_1:
-			{
-				xpath_node_set ns = _left->eval_node_set(c);
-				xpath_node na = ns.first();
-				
-				return xpath_string_const(namespace_uri(na));
-			}
-
-			case ast_func_string_0:
-				return string_value(c.n);
-
-			case ast_func_string_1:
-				return _left->eval_string(c);
-
-			case ast_func_concat:
-			{
-				xpath_string r = _left->eval_string(c);
-				
-				for (xpath_ast_node* n = _right; n; n = n->_next)
-					r.append(n->eval_string(c));
-			
-				return r;
-			}
-
-			case ast_func_substring_before:
-			{
-				xpath_string s = _left->eval_string(c);
-				xpath_string p = _right->eval_string(c);
-
-				const char_t* pos = find_substring(s.c_str(), p.c_str());
-				
-				return pos ? xpath_string(s.c_str(), pos) : xpath_string();
-			}
-			
-			case ast_func_substring_after:
-			{
-				xpath_string s = _left->eval_string(c);
-				xpath_string p = _right->eval_string(c);
-				
-				const char_t* pos = find_substring(s.c_str(), p.c_str());
-				
-				return pos ? xpath_string(pos + p.length()) : xpath_string();
-			}
-
-			case ast_func_substring_2:
-			{
-				xpath_string s = _left->eval_string(c);
-				double first = round_nearest(_right->eval_number(c));
-				
-				if (is_nan(first)) return xpath_string(); // NaN
-				else if (first >= s.length() + 1) return xpath_string();
-				
-				size_t pos = first < 1 ? 1 : (size_t)first;
-				
-				return xpath_string(s.c_str() + (pos - 1));
-			}
-			
-			case ast_func_substring_3:
-			{
-				xpath_string s = _left->eval_string(c);
-				size_t s_length = s.length();
-
-				double first = round_nearest(_right->eval_number(c));
-				double last = first + round_nearest(_right->_next->eval_number(c));
-				
-				if (is_nan(first) || is_nan(last)) return xpath_string();
-				else if (first >= s_length + 1) return xpath_string();
-				else if (first >= last) return xpath_string();
-				
-				size_t pos = first < 1 ? 1 : (size_t)first;
-				size_t end = last >= s_length + 1 ? s_length + 1 : (size_t)last;
-
-				size_t size_requested = end - pos;
-				size_t size_to_end = s_length - pos + 1;
-
-				size_t size = size_requested < size_to_end ? size_requested : size_to_end;
-				
-				return xpath_string(s.c_str() + pos - 1, s.c_str() + pos - 1 + size);
-			}
-
-			case ast_func_normalize_space_0:
-			{
-				xpath_string s = string_value(c.n);
-
-				normalize_space(s.data());
-
-				return s;
-			}
-
-			case ast_func_normalize_space_1:
-			{
-				xpath_string s = _left->eval_string(c);
-
-				normalize_space(s.data());
-			
-				return s;
-			}
-
-			case ast_func_translate:
-			{
-				xpath_string s = _left->eval_string(c);
-				xpath_string from = _right->eval_string(c);
-				xpath_string to = _right->_next->eval_string(c);
-
-				translate(s.data(), from.c_str(), to.c_str());
-
-				return s;
-			}
-
-			default:
-			{
-				switch (_rettype)
-				{
-				case xpath_type_boolean:
-					return xpath_string_const(eval_boolean(c) ? PUGIXML_TEXT("true") : PUGIXML_TEXT("false"));
-					
-				case xpath_type_number:
-					return convert_number_to_string(eval_number(c));
-					
-				case xpath_type_node_set:
-				{
-					xpath_node_set ns = eval_node_set(c);
-					return ns.empty() ? xpath_string() : string_value(ns.first());
-				}
-				
-				default:
-					assert(!"Wrong expression for return type string");
-					return xpath_string();
-				}
-			}
-			}
-		}
-
-		xpath_node_set eval_node_set(const xpath_context& c)
-		{
-			switch (_type)
-			{
-			case ast_op_union:
-			{
-				xpath_node_set ls = _left->eval_node_set(c);
-				xpath_node_set rs = _right->eval_node_set(c);
-				
-				// we can optimize merging two sorted sets, but this is a very rare operation, so don't bother
-  		        ls._type = xpath_node_set::type_unsorted;
-
-				ls.append(rs.begin(), rs.end());
-				
-				ls.remove_duplicates();
-				
-				return ls;
-			}
-
-			case ast_filter:
-			case ast_filter_posinv:
-			{
-				xpath_node_set set = _left->eval_node_set(c);
-
-				// either expression is a number or it contains position() call; sort by document order
-				if (_type == ast_filter) set.sort();
-
-				apply_predicate(set, 0, _right);
-			
-				return set;
-			}
-			
-			case ast_func_id:
-				return xpath_node_set();
-			
-			case ast_step:
-			{
-				xpath_node_set ns;
-				
-				switch (_axis)
-				{
-				case axis_ancestor:
-					step_do(ns, c, axis_to_type<axis_ancestor>());
-					break;
-					
-				case axis_ancestor_or_self:
-					step_do(ns, c, axis_to_type<axis_ancestor_or_self>());
-					break;
-
-				case axis_attribute:
-					step_do(ns, c, axis_to_type<axis_attribute>());
-					break;
-
-				case axis_child:
-					step_do(ns, c, axis_to_type<axis_child>());
-					break;
-				
-				case axis_descendant:
-					step_do(ns, c, axis_to_type<axis_descendant>());
-					break;
-
-				case axis_descendant_or_self:
-					step_do(ns, c, axis_to_type<axis_descendant_or_self>());
-					break;
-
-				case axis_following:
-					step_do(ns, c, axis_to_type<axis_following>());
-					break;
-				
-				case axis_following_sibling:
-					step_do(ns, c, axis_to_type<axis_following_sibling>());
-					break;
-				
-				case axis_namespace:
-					step_do(ns, c, axis_to_type<axis_namespace>());
-					break;
-				
-				case axis_parent:
-					step_do(ns, c, axis_to_type<axis_parent>());
-					break;
-				
-				case axis_preceding:
-					step_do(ns, c, axis_to_type<axis_preceding>());
-					break;
-
-				case axis_preceding_sibling:
-					step_do(ns, c, axis_to_type<axis_preceding_sibling>());
-					break;
-				
-				case axis_self:
-					step_do(ns, c, axis_to_type<axis_self>());
-					break;
-				}
-				
-				ns.remove_duplicates();
-				
-				return ns;
-			}
-
-			case ast_step_root:
-			{
-				assert(!_right); // root step can't have any predicates
-
-				xpath_node_set ns;
-				ns._type = xpath_node_set::type_sorted;
-
-				if (c.n.node()) ns.push_back(c.n.node().root());
-				else if (c.n.attribute()) ns.push_back(c.n.parent().root());
-
-				return ns;
-			}
-
-			default:
-				assert(!"Wrong expression for return type node set");
-				return xpath_node_set();
-			}
-		}
-		
-		bool is_posinv()
-		{
-			switch (_type)
-			{
-			case ast_func_position:
-				return false;
-
-			case ast_string_constant:
-			case ast_number_constant:
-			// $$ case ast_variable:
-				return true;
-
-			case ast_step:
-			case ast_step_root:
-				return true;
-
-			case ast_predicate:
-			case ast_filter:
-			case ast_filter_posinv:
-				return true;
-
-			default:
-				if (_left && !_left->is_posinv()) return false;
-				
-				for (xpath_ast_node* n = _right; n; n = n->_next)
-					if (!n->is_posinv()) return false;
-					
-				return true;
-			}
-		}
-
-		xpath_value_type rettype() const
-		{
-			return static_cast<xpath_value_type>(_rettype);
-		}
-	};
-
-	struct xpath_parser
-	{
-	    xpath_allocator& _alloc;
-	    xpath_lexer _lexer;
-		const char_t* _query;
-		xpath_parse_result* _result;
-		jmp_buf _error_handler;
-
-		xpath_parser(const xpath_parser&);
-		xpath_parser& operator=(const xpath_parser&);
-
-		void throw_error(const char* message)
-		{
-			_result->error = message;
-			_result->offset = _lexer.current_pos() - _query;
-
-			longjmp(_error_handler, 1);
-		}
-
-		void* alloc_node()
-		{
-			void* result = _alloc.allocate(sizeof(xpath_ast_node));
-
-			if (!result) throw_error("Out of memory");
-
-			return result;
-		}
-
-		const char_t* alloc_string(const xpath_lexer_string& value)
-		{
-			if (value.begin)
-			{
-				size_t length = static_cast<size_t>(value.end - value.begin);
-
-				char_t* c = static_cast<char_t*>(_alloc.allocate((length + 1) * sizeof(char_t)));
-				if (!c) throw_error("Out of memory");
-
-				memcpy(c, value.begin, length * sizeof(char_t));
-				c[length] = 0;
-
-				return c;
-			}
-			else return 0;
-		}
-
-		xpath_ast_node* parse_function_helper(ast_type_t type0, ast_type_t type1, size_t argc, xpath_ast_node* args[2])
-		{
-			assert(argc <= 1);
-
-			if (argc == 1 && args[0]->rettype() != xpath_type_node_set) throw_error("Function has to be applied to node set");
-
-			return new (alloc_node()) xpath_ast_node(argc == 0 ? type0 : type1, xpath_type_string, args[0]);
-		}
-
-		xpath_ast_node* parse_function(const xpath_lexer_string& name, size_t argc, xpath_ast_node* args[2])
-		{
-			switch (name.begin[0])
-			{
-			case 'b':
-				if (name == PUGIXML_TEXT("boolean") && argc == 1)
-					return new (alloc_node()) xpath_ast_node(ast_func_boolean, xpath_type_boolean, args[0]);
-					
-				break;
-			
-			case 'c':
-				if (name == PUGIXML_TEXT("count") && argc == 1)
-				{
-					if (args[0]->rettype() != xpath_type_node_set) throw_error("count() has to be applied to node set");
-					return new (alloc_node()) xpath_ast_node(ast_func_count, xpath_type_number, args[0]);
-				}
-				else if (name == PUGIXML_TEXT("contains") && argc == 2)
-					return new (alloc_node()) xpath_ast_node(ast_func_contains, xpath_type_string, args[0], args[1]);
-				else if (name == PUGIXML_TEXT("concat") && argc >= 2)
-					return new (alloc_node()) xpath_ast_node(ast_func_concat, xpath_type_string, args[0], args[1]);
-				else if (name == PUGIXML_TEXT("ceiling") && argc == 1)
-					return new (alloc_node()) xpath_ast_node(ast_func_ceiling, xpath_type_number, args[0]);
-					
-				break;
-			
-			case 'f':
-				if (name == PUGIXML_TEXT("false") && argc == 0)
-					return new (alloc_node()) xpath_ast_node(ast_func_false, xpath_type_boolean);
-				else if (name == PUGIXML_TEXT("floor") && argc == 1)
-					return new (alloc_node()) xpath_ast_node(ast_func_floor, xpath_type_number, args[0]);
-					
-				break;
-			
-			case 'i':
-				if (name == PUGIXML_TEXT("id") && argc == 1)
-					return new (alloc_node()) xpath_ast_node(ast_func_id, xpath_type_node_set, args[0]);
-					
-				break;
-			
-			case 'l':
-				if (name == PUGIXML_TEXT("last") && argc == 0)
-					return new (alloc_node()) xpath_ast_node(ast_func_last, xpath_type_number);
-				else if (name == PUGIXML_TEXT("lang") && argc == 1)
-					return new (alloc_node()) xpath_ast_node(ast_func_lang, xpath_type_boolean, args[0]);
-				else if (name == PUGIXML_TEXT("local-name") && argc <= 1)
-					return parse_function_helper(ast_func_local_name_0, ast_func_local_name_1, argc, args);
-			
-				break;
-			
-			case 'n':
-				if (name == PUGIXML_TEXT("name") && argc <= 1)
-					return parse_function_helper(ast_func_name_0, ast_func_name_1, argc, args);
-				else if (name == PUGIXML_TEXT("namespace-uri") && argc <= 1)
-					return parse_function_helper(ast_func_namespace_uri_0, ast_func_namespace_uri_1, argc, args);
-				else if (name == PUGIXML_TEXT("normalize-space") && argc <= 1)
-					return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_normalize_space_0 : ast_func_normalize_space_1, xpath_type_string, args[0], args[1]);
-				else if (name == PUGIXML_TEXT("not") && argc == 1)
-					return new (alloc_node()) xpath_ast_node(ast_func_not, xpath_type_boolean, args[0]);
-				else if (name == PUGIXML_TEXT("number") && argc <= 1)
-					return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_number_0 : ast_func_number_1, xpath_type_number, args[0]);
-			
-				break;
-			
-			case 'p':
-				if (name == PUGIXML_TEXT("position") && argc == 0)
-					return new (alloc_node()) xpath_ast_node(ast_func_position, xpath_type_number);
-				
-				break;
-			
-			case 'r':
-				if (name == PUGIXML_TEXT("round") && argc == 1)
-					return new (alloc_node()) xpath_ast_node(ast_func_round, xpath_type_number, args[0]);
-
-				break;
-			
-			case 's':
-				if (name == PUGIXML_TEXT("string") && argc <= 1)
-					return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_string_0 : ast_func_string_1, xpath_type_string, args[0]);
-				else if (name == PUGIXML_TEXT("string-length") && argc <= 1)
-					return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_string_length_0 : ast_func_string_length_1, xpath_type_string, args[0]);
-				else if (name == PUGIXML_TEXT("starts-with") && argc == 2)
-					return new (alloc_node()) xpath_ast_node(ast_func_starts_with, xpath_type_boolean, args[0], args[1]);
-				else if (name == PUGIXML_TEXT("substring-before") && argc == 2)
-					return new (alloc_node()) xpath_ast_node(ast_func_substring_before, xpath_type_string, args[0], args[1]);
-				else if (name == PUGIXML_TEXT("substring-after") && argc == 2)
-					return new (alloc_node()) xpath_ast_node(ast_func_substring_after, xpath_type_string, args[0], args[1]);
-				else if (name == PUGIXML_TEXT("substring") && (argc == 2 || argc == 3))
-					return new (alloc_node()) xpath_ast_node(argc == 2 ? ast_func_substring_2 : ast_func_substring_3, xpath_type_string, args[0], args[1]);
-				else if (name == PUGIXML_TEXT("sum") && argc == 1)
-				{
-					if (args[0]->rettype() != xpath_type_node_set) throw_error("sum() has to be applied to node set");
-					return new (alloc_node()) xpath_ast_node(ast_func_sum, xpath_type_number, args[0]);
-				}
-
-				break;
-			
-			case 't':
-				if (name == PUGIXML_TEXT("translate") && argc == 3)
-					return new (alloc_node()) xpath_ast_node(ast_func_translate, xpath_type_string, args[0], args[1]);
-				else if (name == PUGIXML_TEXT("true") && argc == 0)
-					return new (alloc_node()) xpath_ast_node(ast_func_true, xpath_type_boolean);
-					
-				break;
-			}
-
-			throw_error("Unrecognized function or wrong parameter count");
-
-			return 0;
-		}
-
-		axis_t parse_axis_name(const xpath_lexer_string& name, bool& specified)
-		{
-			specified = true;
-
-			switch (name.begin[0])
-			{
-			case 'a':
-				if (name == PUGIXML_TEXT("ancestor"))
-					return axis_ancestor;
-				else if (name == PUGIXML_TEXT("ancestor-or-self"))
-					return axis_ancestor_or_self;
-				else if (name == PUGIXML_TEXT("attribute"))
-					return axis_attribute;
-				
-				break;
-			
-			case 'c':
-				if (name == PUGIXML_TEXT("child"))
-					return axis_child;
-				
-				break;
-			
-			case 'd':
-				if (name == PUGIXML_TEXT("descendant"))
-					return axis_descendant;
-				else if (name == PUGIXML_TEXT("descendant-or-self"))
-					return axis_descendant_or_self;
-				
-				break;
-			
-			case 'f':
-				if (name == PUGIXML_TEXT("following"))
-					return axis_following;
-				else if (name == PUGIXML_TEXT("following-sibling"))
-					return axis_following_sibling;
-				
-				break;
-			
-			case 'n':
-				if (name == PUGIXML_TEXT("namespace"))
-					return axis_namespace;
-				
-				break;
-			
-			case 'p':
-				if (name == PUGIXML_TEXT("parent"))
-					return axis_parent;
-				else if (name == PUGIXML_TEXT("preceding"))
-					return axis_preceding;
-				else if (name == PUGIXML_TEXT("preceding-sibling"))
-					return axis_preceding_sibling;
-				
-				break;
-			
-			case 's':
-				if (name == PUGIXML_TEXT("self"))
-					return axis_self;
-				
-				break;
-			}
-
-			specified = false;
-			return axis_child;
-		}
-
-		nodetest_t parse_node_test_type(const xpath_lexer_string& name)
-		{
-			switch (name.begin[0])
-			{
-			case 'c':
-				if (name == PUGIXML_TEXT("comment"))
-					return nodetest_type_comment;
-
-				break;
-
-			case 'n':
-				if (name == PUGIXML_TEXT("node"))
-					return nodetest_type_node;
-
-				break;
-
-			case 'p':
-				if (name == PUGIXML_TEXT("processing-instruction"))
-					return nodetest_type_pi;
-
-				break;
-
-			case 't':
-				if (name == PUGIXML_TEXT("text"))
-					return nodetest_type_text;
-
-				break;
-			}
-
-			return nodetest_none;
-		}
-
-	    // PrimaryExpr ::= VariableReference | '(' Expr ')' | Literal | Number | FunctionCall
-	    xpath_ast_node* parse_primary_expression()
-	    {
-	    	switch (_lexer.current())
-	    	{
-	    	case lex_var_ref:
-	    	{
-				throw_error("Variables are not supported");
-
-	    		return 0;
-			}
-
-			case lex_open_brace:
-			{
-				_lexer.next();
-
-				xpath_ast_node* n = parse_expression();
-
-				if (_lexer.current() != lex_close_brace)
-					throw_error("Unmatched braces");
-
-				_lexer.next();
-
-				return n;
-			}
-
-			case lex_quoted_string:
-			{
-				const char_t* value = alloc_string(_lexer.contents());
-
-				xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_string_constant, xpath_type_string, value);
-				_lexer.next();
-
-				return n;
-			}
-
-			case lex_number:
-			{
-				double value = 0;
-
-				if (!convert_string_to_number(_lexer.contents().begin, _lexer.contents().end, &value))
-					throw_error("Out of memory");
-
-				xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_number_constant, xpath_type_number, value);
-				_lexer.next();
-
-				return n;
-			}
-
-			case lex_string:
-			{
-				xpath_ast_node* args[2] = {0};
-				size_t argc = 0;
-				
-				xpath_lexer_string function = _lexer.contents();
-				_lexer.next();
-				
-				xpath_ast_node* last_arg = 0;
-				
-				if (_lexer.current() != lex_open_brace)
-					throw_error("Unrecognized function call");
-				_lexer.next();
-
-				if (_lexer.current() != lex_close_brace)
-					args[argc++] = parse_expression();
-
-				while (_lexer.current() != lex_close_brace)
-				{
-					if (_lexer.current() != lex_comma)
-						throw_error("No comma between function arguments");
-					_lexer.next();
-					
-					xpath_ast_node* n = parse_expression();
-					
-					if (argc < 2) args[argc] = n;
-					else last_arg->set_next(n);
-
-					argc++;
-					last_arg = n;
-				}
-				
-				_lexer.next();
-
-				return parse_function(function, argc, args);
-			}
-
-	    	default:
-	    		throw_error("Unrecognizable primary expression");
-
-	    		return 0;
-	    	}
-	    }
-	    
-	    // FilterExpr ::= PrimaryExpr | FilterExpr Predicate
-	    // Predicate ::= '[' PredicateExpr ']'
-	    // PredicateExpr ::= Expr
-	    xpath_ast_node* parse_filter_expression()
-	    {
-	    	xpath_ast_node* n = parse_primary_expression();
-
-	    	while (_lexer.current() == lex_open_square_brace)
-	    	{
-	    		_lexer.next();
-
-				xpath_ast_node* expr = parse_expression();
-
-				if (n->rettype() != xpath_type_node_set) throw_error("Predicate has to be applied to node set");
-
-				bool posinv = expr->rettype() != xpath_type_number && expr->is_posinv();
-
-	    		n = new (alloc_node()) xpath_ast_node(posinv ? ast_filter_posinv : ast_filter, xpath_type_node_set, n, expr);
-
-	    		if (_lexer.current() != lex_close_square_brace)
-	    			throw_error("Unmatched square brace");
-	    	
-	    		_lexer.next();
-	    	}
-	    	
-	    	return n;
-	    }
-	    
-	    // Step ::= AxisSpecifier NodeTest Predicate* | AbbreviatedStep
-	    // AxisSpecifier ::= AxisName '::' | '@'?
-	    // NodeTest ::= NameTest | NodeType '(' ')' | 'processing-instruction' '(' Literal ')'
-	    // NameTest ::= '*' | NCName ':' '*' | QName
-	    // AbbreviatedStep ::= '.' | '..'
-	    xpath_ast_node* parse_step(xpath_ast_node* set)
-	    {
-			if (set && set->rettype() != xpath_type_node_set)
-				throw_error("Step has to be applied to node set");
-
-			bool axis_specified = false;
-			axis_t axis = axis_child; // implied child axis
-
-			if (_lexer.current() == lex_axis_attribute)
-			{
-				axis = axis_attribute;
-				axis_specified = true;
-				
-				_lexer.next();
-			}
-			else if (_lexer.current() == lex_dot)
-			{
-				_lexer.next();
-				
-				return new (alloc_node()) xpath_ast_node(ast_step, set, axis_self, nodetest_type_node, 0);
-			}
-			else if (_lexer.current() == lex_double_dot)
-			{
-				_lexer.next();
-				
-				return new (alloc_node()) xpath_ast_node(ast_step, set, axis_parent, nodetest_type_node, 0);
-			}
-	    
-			nodetest_t nt_type = nodetest_none;
-			xpath_lexer_string nt_name;
-			
-			if (_lexer.current() == lex_string)
-			{
-				// node name test
-				nt_name = _lexer.contents();
-				_lexer.next();
-
-				// was it an axis name?
-				if (_lexer.current() == lex_double_colon)
-				{
-					// parse axis name
-					if (axis_specified) throw_error("Two axis specifiers in one step");
-
-					axis = parse_axis_name(nt_name, axis_specified);
-
-					if (!axis_specified) throw_error("Unknown axis");
-
-					// read actual node test
-					_lexer.next();
-
-					if (_lexer.current() == lex_multiply)
-					{
-						nt_type = nodetest_all;
-						nt_name = xpath_lexer_string();
-						_lexer.next();
-					}
-					else if (_lexer.current() == lex_string)
-					{
-						nt_name = _lexer.contents();
-						_lexer.next();
-					}
-					else throw_error("Unrecognized node test");
-				}
-				
-				if (nt_type == nodetest_none)
-				{
-					// node type test or processing-instruction
-					if (_lexer.current() == lex_open_brace)
-					{
-						_lexer.next();
-						
-						if (_lexer.current() == lex_close_brace)
-						{
-							_lexer.next();
-
-							nt_type = parse_node_test_type(nt_name);
-
-							if (nt_type == nodetest_none) throw_error("Unrecognized node type");
-							
-							nt_name = xpath_lexer_string();
-						}
-						else if (nt_name == PUGIXML_TEXT("processing-instruction"))
-						{
-							if (_lexer.current() != lex_quoted_string)
-								throw_error("Only literals are allowed as arguments to processing-instruction()");
-						
-							nt_type = nodetest_pi;
-							nt_name = _lexer.contents();
-							_lexer.next();
-							
-							if (_lexer.current() != lex_close_brace)
-								throw_error("Unmatched brace near processing-instruction()");
-							_lexer.next();
-						}
-						else
-							throw_error("Unmatched brace near node type test");
-
-					}
-					// QName or NCName:*
-					else
-					{
-						const char_t* colon_pos = pstd::find(nt_name.begin, nt_name.end, ':');
-
-						if (colon_pos + 2 == nt_name.end && colon_pos[1] == '*') // NCName:*
-						{
-							nt_name.end--; // erase *
-							
-							nt_type = nodetest_all_in_namespace;
-						}
-						else nt_type = nodetest_name;
-					}
-				}
-			}
-			else if (_lexer.current() == lex_multiply)
-			{
-				nt_type = nodetest_all;
-				_lexer.next();
-			}
-			else throw_error("Unrecognized node test");
-			
-			xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_step, set, axis, nt_type, alloc_string(nt_name));
-			
-			xpath_ast_node* last = 0;
-			
-			while (_lexer.current() == lex_open_square_brace)
-			{
-				_lexer.next();
-				
-				xpath_ast_node* expr = parse_expression();
-
-				xpath_ast_node* pred = new (alloc_node()) xpath_ast_node(ast_predicate, xpath_type_node_set, expr);
-				
-				if (_lexer.current() != lex_close_square_brace)
-	    			throw_error("Unmatched square brace");
-				_lexer.next();
-				
-				if (last) last->set_next(pred);
-				else n->set_right(pred);
-				
-				last = pred;
-			}
-			
-			return n;
-	    }
-	    
-	    // RelativeLocationPath ::= Step | RelativeLocationPath '/' Step | RelativeLocationPath '//' Step
-	    xpath_ast_node* parse_relative_location_path(xpath_ast_node* set)
-	    {
-			xpath_ast_node* n = parse_step(set);
-			
-			while (_lexer.current() == lex_slash || _lexer.current() == lex_double_slash)
-			{
-				lexeme_t l = _lexer.current();
-				_lexer.next();
-
-				if (l == lex_double_slash)
-					n = new (alloc_node()) xpath_ast_node(ast_step, n, axis_descendant_or_self, nodetest_type_node, 0);
-				
-				n = parse_step(n);
-			}
-			
-			return n;
-	    }
-	    
-	    // LocationPath ::= RelativeLocationPath | AbsoluteLocationPath
-	    // AbsoluteLocationPath ::= '/' RelativeLocationPath? | '//' RelativeLocationPath
-	    xpath_ast_node* parse_location_path()
-	    {
-			if (_lexer.current() == lex_slash)
-			{
-				_lexer.next();
-				
-				xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_step_root, xpath_type_node_set);
-
-				// relative location path can start from axis_attribute, dot, double_dot, multiply and string lexemes; any other lexeme means standalone root path
-				lexeme_t l = _lexer.current();
-
-				if (l == lex_string || l == lex_axis_attribute || l == lex_dot || l == lex_double_dot || l == lex_multiply)
-					return parse_relative_location_path(n);
-				else
-					return n;
-			}
-			else if (_lexer.current() == lex_double_slash)
-			{
-				_lexer.next();
-				
-				xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_step_root, xpath_type_node_set);
-				n = new (alloc_node()) xpath_ast_node(ast_step, n, axis_descendant_or_self, nodetest_type_node, 0);
-				
-				return parse_relative_location_path(n);
-			}
-			else
-			{
-				return parse_relative_location_path(0);
-			}
-	    }
-	    
-	    // PathExpr ::= LocationPath
-	    //				| FilterExpr
-	    //				| FilterExpr '/' RelativeLocationPath
-	    //				| FilterExpr '//' RelativeLocationPath
-	    xpath_ast_node* parse_path_expression()
-	    {
-			// Clarification.
-			// PathExpr begins with either LocationPath or FilterExpr.
-			// FilterExpr begins with PrimaryExpr
-			// PrimaryExpr begins with '$' in case of it being a variable reference,
-			// '(' in case of it being an expression, string literal, number constant or
-			// function call.
-
-			if (_lexer.current() == lex_var_ref || _lexer.current() == lex_open_brace || 
-				_lexer.current() == lex_quoted_string || _lexer.current() == lex_number ||
-				_lexer.current() == lex_string)
-	    	{
-	    		if (_lexer.current() == lex_string)
-	    		{
-	    			// This is either a function call, or not - if not, we shall proceed with location path
-	    			const char_t* state = _lexer.state();
-	    			
-					while (IS_CHARTYPEX(*state, ctx_space)) ++state;
-	    			
-	    			if (*state != '(') return parse_location_path();
-
-					// This looks like a function call; however this still can be a node-test. Check it.
-					if (parse_node_test_type(_lexer.contents()) != nodetest_none) return parse_location_path();
-	    		}
-	    		
-	    		xpath_ast_node* n = parse_filter_expression();
-
-	    		if (_lexer.current() == lex_slash || _lexer.current() == lex_double_slash)
-	    		{
-					lexeme_t l = _lexer.current();
-	    			_lexer.next();
-	    			
-					if (l == lex_double_slash)
-					{
-						if (n->rettype() != xpath_type_node_set) throw_error("Step has to be applied to node set");
-
-						n = new (alloc_node()) xpath_ast_node(ast_step, n, axis_descendant_or_self, nodetest_type_node, 0);
-					}
-	
-	    			// select from location path
-	    			return parse_relative_location_path(n);
-	    		}
-
-	    		return n;
-	    	}
-	    	else return parse_location_path();
-	    }
-
-	    // UnionExpr ::= PathExpr | UnionExpr '|' PathExpr
-	    xpath_ast_node* parse_union_expression()
-	    {
-	    	xpath_ast_node* n = parse_path_expression();
-
-	    	while (_lexer.current() == lex_union)
-	    	{
-	    		_lexer.next();
-
-				xpath_ast_node* expr = parse_union_expression();
-
-				if (n->rettype() != xpath_type_node_set || expr->rettype() != xpath_type_node_set)
-					throw_error("Union operator has to be applied to node sets");
-
-	    		n = new (alloc_node()) xpath_ast_node(ast_op_union, xpath_type_node_set, n, expr);
-	    	}
-
-	    	return n;
-	    }
-
-	    // UnaryExpr ::= UnionExpr | '-' UnaryExpr
-	    xpath_ast_node* parse_unary_expression()
-	    {
-	    	if (_lexer.current() == lex_minus)
-	    	{
-	    		_lexer.next();
-
-				xpath_ast_node* expr = parse_unary_expression();
-
-	    		return new (alloc_node()) xpath_ast_node(ast_op_negate, xpath_type_number, expr);
-	    	}
-	    	else return parse_union_expression();
-	    }
-	    
-	    // MultiplicativeExpr ::= UnaryExpr
-	    //						  | MultiplicativeExpr '*' UnaryExpr
-	    //						  | MultiplicativeExpr 'div' UnaryExpr
-	    //						  | MultiplicativeExpr 'mod' UnaryExpr
-	    xpath_ast_node* parse_multiplicative_expression()
-	    {
-	    	xpath_ast_node* n = parse_unary_expression();
-
-	    	while (_lexer.current() == lex_multiply || (_lexer.current() == lex_string &&
-	    		   (_lexer.contents() == PUGIXML_TEXT("mod") || _lexer.contents() == PUGIXML_TEXT("div"))))
-	    	{
-	    		ast_type_t op = _lexer.current() == lex_multiply ? ast_op_multiply :
-	    			_lexer.contents().begin[0] == 'd' ? ast_op_divide : ast_op_mod;
-	    		_lexer.next();
-
-				xpath_ast_node* expr = parse_unary_expression();
-
-	    		n = new (alloc_node()) xpath_ast_node(op, xpath_type_number, n, expr);
-	    	}
-
-	    	return n;
-	    }
-
-	    // AdditiveExpr ::= MultiplicativeExpr
-	    //					| AdditiveExpr '+' MultiplicativeExpr
-	    //					| AdditiveExpr '-' MultiplicativeExpr
-	    xpath_ast_node* parse_additive_expression()
-	    {
-	    	xpath_ast_node* n = parse_multiplicative_expression();
-
-	    	while (_lexer.current() == lex_plus || _lexer.current() == lex_minus)
-	    	{
-	    		lexeme_t l = _lexer.current();
-
-	    		_lexer.next();
-
-				xpath_ast_node* expr = parse_multiplicative_expression();
-
-	    		n = new (alloc_node()) xpath_ast_node(l == lex_plus ? ast_op_add : ast_op_subtract, xpath_type_number, n, expr);
-	    	}
-
-	    	return n;
-	    }
-
-	    // RelationalExpr ::= AdditiveExpr
-	    //					  | RelationalExpr '<' AdditiveExpr
-	    //					  | RelationalExpr '>' AdditiveExpr
-	    //					  | RelationalExpr '<=' AdditiveExpr
-	    //					  | RelationalExpr '>=' AdditiveExpr
-	    xpath_ast_node* parse_relational_expression()
-	    {
-	    	xpath_ast_node* n = parse_additive_expression();
-
-	    	while (_lexer.current() == lex_less || _lexer.current() == lex_less_or_equal || 
-	    		   _lexer.current() == lex_greater || _lexer.current() == lex_greater_or_equal)
-	    	{
-	    		lexeme_t l = _lexer.current();
-	    		_lexer.next();
-
-				xpath_ast_node* expr = parse_additive_expression();
-
-	    		n = new (alloc_node()) xpath_ast_node(l == lex_less ? ast_op_less : l == lex_greater ? ast_op_greater :
-	    						l == lex_less_or_equal ? ast_op_less_or_equal : ast_op_greater_or_equal, xpath_type_boolean, n, expr);
-	    	}
-
-	    	return n;
-	    }
-	    
-	    // EqualityExpr ::= RelationalExpr
-	    //					| EqualityExpr '=' RelationalExpr
-	    //					| EqualityExpr '!=' RelationalExpr
-	    xpath_ast_node* parse_equality_expression()
-	    {
-	    	xpath_ast_node* n = parse_relational_expression();
-
-	    	while (_lexer.current() == lex_equal || _lexer.current() == lex_not_equal)
-	    	{
-	    		lexeme_t l = _lexer.current();
-
-	    		_lexer.next();
-
-				xpath_ast_node* expr = parse_relational_expression();
-
-	    		n = new (alloc_node()) xpath_ast_node(l == lex_equal ? ast_op_equal : ast_op_not_equal, xpath_type_boolean, n, expr);
-	    	}
-
-	    	return n;
-	    }
-	    
-	    // AndExpr ::= EqualityExpr | AndExpr 'and' EqualityExpr
-	    xpath_ast_node* parse_and_expression()
-	    {
-	    	xpath_ast_node* n = parse_equality_expression();
-
-	    	while (_lexer.current() == lex_string && _lexer.contents() == PUGIXML_TEXT("and"))
-	    	{
-	    		_lexer.next();
-
-				xpath_ast_node* expr = parse_equality_expression();
-
-	    		n = new (alloc_node()) xpath_ast_node(ast_op_and, xpath_type_boolean, n, expr);
-	    	}
-
-	    	return n;
-	    }
-
-	    // OrExpr ::= AndExpr | OrExpr 'or' AndExpr
-	    xpath_ast_node* parse_or_expression()
-	    {
-	    	xpath_ast_node* n = parse_and_expression();
-
-	    	while (_lexer.current() == lex_string && _lexer.contents() == PUGIXML_TEXT("or"))
-	    	{
-	    		_lexer.next();
-
-				xpath_ast_node* expr = parse_and_expression();
-
-	    		n = new (alloc_node()) xpath_ast_node(ast_op_or, xpath_type_boolean, n, expr);
-	    	}
-
-	    	return n;
-	    }
-		
-		// Expr ::= OrExpr
-		xpath_ast_node* parse_expression()
-		{
-			return parse_or_expression();
-		}
-
-		xpath_parser(const char_t* query, xpath_allocator& alloc, xpath_parse_result* result): _alloc(alloc), _lexer(query), _query(query), _result(result)
-		{
-		}
-
-		xpath_ast_node* parse()
-		{
-			xpath_ast_node* result = parse_expression();
-			
-			if (_lexer.current() != lex_eof)
-			{
-				// there are still unparsed tokens left, error
-				throw_error("Incorrect query");
-			}
-			
-			return result;
-		}
-
-		static xpath_ast_node* parse(const char_t* query, xpath_allocator& alloc, xpath_parse_result* result)
-		{
-			xpath_parser parser(query, alloc, result);
-
-			int error = setjmp(parser._error_handler);
-
-			return (error == 0) ? parser.parse() : 0;
-		}
-	};
-
-	const char* xpath_parse_result::description() const
-	{
-		return error ? error : "No error";
-	}
-
-	xpath_query::xpath_query(const char_t* query): _alloc(0), _root(0)
-	{
-		_result.error = 0;
-		_result.offset = 0;
-
-		_alloc = xpath_allocator::create();
-
-		if (!_alloc)
-		{
-			_result.error = "Out of memory";
-		}
-		else
-		{
-			_root = xpath_parser::parse(query, *_alloc, &_result);
-		}
-
-		if (!_root)
-		{
-			xpath_allocator::destroy(_alloc);
-			_alloc = 0;
-
-		#ifndef PUGIXML_NO_EXCEPTIONS
-			throw xpath_exception(_result);
-		#endif
-		}
-	}
-
-	xpath_query::~xpath_query()
-	{
-		xpath_allocator::destroy(_alloc);
-	}
-
-	xpath_value_type xpath_query::return_type() const
-	{
-		if (!_root) return xpath_type_none;
-
-		return _root->rettype();
-	}
-
-	bool xpath_query::evaluate_boolean(const xpath_node& n) const
-	{
-		if (!_root) return false;
-		
-		xpath_context c(n, 1, 1);
-		
-		return _root->eval_boolean(c);
-	}
-	
-	double xpath_query::evaluate_number(const xpath_node& n) const
-	{
-		if (!_root) return gen_nan();
-		
-		xpath_context c(n, 1, 1);
-		
-		return _root->eval_number(c);
-	}
-	
-#ifndef PUGIXML_NO_STL
-	string_t xpath_query::evaluate_string(const xpath_node& n) const
-	{
-		if (!_root) return string_t();
-		
-		xpath_context c(n, 1, 1);
-		
-		return _root->eval_string(c).c_str();
-	}
-#endif
-	
-	size_t xpath_query::evaluate_string(char_t* buffer, size_t capacity, const xpath_node& n) const
-	{
-		xpath_context c(n, 1, 1);
-		xpath_string r = _root ? _root->eval_string(c) : xpath_string();
-
-		size_t size = r.length() + 1;
-		
-		// $$ zero-terminate?
-		if (capacity > 0) memcpy(buffer, r.c_str(), (size < capacity ? size : capacity) * sizeof(char_t));
-		
-		return size;
-	}
-
-	xpath_node_set xpath_query::evaluate_node_set(const xpath_node& n) const
-	{
-		if (!_root) return xpath_node_set();
-
-		if (_root->rettype() != xpath_type_node_set)
-		{
-		#ifdef PUGIXML_NO_EXCEPTIONS
-			return xpath_node_set();
-		#else
-			xpath_parse_result result = {"Expression does not evaluate to node set", 0};
-			throw xpath_exception(result);
-		#endif
-		}
-		
-		xpath_context c(n, 1, 1);
-		
-		return _root->eval_node_set(c);
-	}
-
-	const xpath_parse_result& xpath_query::result() const
-	{
-		return _result;
-	}
-
-	xpath_query::operator unspecified_bool_type() const
-	{
-		return _root ? &xpath_query::_root : 0;
-	}
-
-	bool xpath_query::operator!() const
-	{
-		return !_root;
-	}
-
-	xpath_node xml_node::select_single_node(const char_t* query) const
-	{
-		xpath_query q(query);
-		return select_single_node(q);
-	}
-
-	xpath_node xml_node::select_single_node(const xpath_query& query) const
-	{
-		xpath_node_set s = query.evaluate_node_set(*this);
-		return s.empty() ? xpath_node() : s.first();
-	}
-
-	xpath_node_set xml_node::select_nodes(const char_t* query) const
-	{
-		xpath_query q(query);
-		return select_nodes(q);
-	}
-
-	xpath_node_set xml_node::select_nodes(const xpath_query& query) const
-	{
-		return query.evaluate_node_set(*this);
-	}
-}
-
-#endif
-
-/**
- * Copyright (c) 2006-2010 Arseny Kapoulkine
- *
- * Permission is hereby granted, free of charge, to any person
- * obtaining a copy of this software and associated documentation
- * files (the "Software"), to deal in the Software without
- * restriction, including without limitation the rights to use,
- * copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following
- * conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- * 
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
- * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
- * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
- * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- * OTHER DEALINGS IN THE SOFTWARE.
- */