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Module xpathInternals from libxml2

deps/src/libxml2-2.9.1/doc/html/libxml-xpathInternals.html

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Module xpathInternals from libxml2

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| | xpath | | API documentation | | The XML C parser and toolkit of Gnome | xpointer | |

internal interfaces for XML Path Language implementation used to build new modules on top of XPath like XPointer and XSLT

Table of Contents

#define[CAST\_TO\_BOOLEAN](#CAST_TO_BOOLEAN)

#define[CAST\_TO\_NUMBER](#CAST_TO_NUMBER)

#define[CAST\_TO\_STRING](#CAST_TO_STRING)

#define[CHECK\_ARITY](#CHECK_ARITY)

#define[CHECK\_ERROR](#CHECK_ERROR)

#define[CHECK\_ERROR0](#CHECK_ERROR0)

#define[CHECK\_TYPE](#CHECK_TYPE)

#define[CHECK\_TYPE0](#CHECK_TYPE0)

#define[XP\_ERROR](#XP_ERROR)

#define[XP\_ERROR0](#XP_ERROR0)

#define[xmlXPathCheckError](#xmlXPathCheckError)

#define[xmlXPathEmptyNodeSet](#xmlXPathEmptyNodeSet)

#define[xmlXPathGetContextNode](#xmlXPathGetContextNode)

#define[xmlXPathGetDocument](#xmlXPathGetDocument)

#define[xmlXPathGetError](#xmlXPathGetError)

#define[xmlXPathReturnBoolean](#xmlXPathReturnBoolean)

#define[xmlXPathReturnEmptyNodeSet](#xmlXPathReturnEmptyNodeSet)

#define[xmlXPathReturnEmptyString](#xmlXPathReturnEmptyString)

#define[xmlXPathReturnExternal](#xmlXPathReturnExternal)

#define[xmlXPathReturnFalse](#xmlXPathReturnFalse)

#define[xmlXPathReturnNodeSet](#xmlXPathReturnNodeSet)

#define[xmlXPathReturnNumber](#xmlXPathReturnNumber)

#define[xmlXPathReturnString](#xmlXPathReturnString)

#define[xmlXPathReturnTrue](#xmlXPathReturnTrue)

#define[xmlXPathSetArityError](#xmlXPathSetArityError)

#define[xmlXPathSetError](#xmlXPathSetError)

#define[xmlXPathSetTypeError](#xmlXPathSetTypeError)

#define[xmlXPathStackIsExternal](#xmlXPathStackIsExternal)

#define[xmlXPathStackIsNodeSet](#xmlXPathStackIsNodeSet)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[valuePop](#valuePop)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

int[valuePush](#valuePush)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)value)

void[xmlXPathAddValues](#xmlXPathAddValues)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

void[xmlXPathBooleanFunction](#xmlXPathBooleanFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathCeilingFunction](#xmlXPathCeilingFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

int[xmlXPathCompareValues](#xmlXPathCompareValues)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int inf,
int strict)

void[xmlXPathConcatFunction](#xmlXPathConcatFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathContainsFunction](#xmlXPathContainsFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathCountFunction](#xmlXPathCountFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathDebugDumpCompExpr](#xmlXPathDebugDumpCompExpr)(FILE * output,
[xmlXPathCompExprPtr](libxml-xpath.html#xmlXPathCompExprPtr)comp,
int depth)

void[xmlXPathDebugDumpObject](#xmlXPathDebugDumpObject)(FILE * output,
[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)cur,
int depth)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathDifference](#xmlXPathDifference)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathDistinct](#xmlXPathDistinct)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathDistinctSorted](#xmlXPathDistinctSorted)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes)

void[xmlXPathDivValues](#xmlXPathDivValues)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

int[xmlXPathEqualValues](#xmlXPathEqualValues)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

void[xmlXPathErr](#xmlXPathErr)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int error)

void[xmlXPathEvalExpr](#xmlXPathEvalExpr)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

int[xmlXPathEvaluatePredicateResult](#xmlXPathEvaluatePredicateResult)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)res)

void[xmlXPathFalseFunction](#xmlXPathFalseFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathFloorFunction](#xmlXPathFloorFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathFreeParserContext](#xmlXPathFreeParserContext)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

[xmlXPathFunction](libxml-xpath.html#xmlXPathFunction)[xmlXPathFunctionLookup](#xmlXPathFunctionLookup)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name)

[xmlXPathFunction](libxml-xpath.html#xmlXPathFunction)[xmlXPathFunctionLookupNS](#xmlXPathFunctionLookupNS)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
const[xmlChar](libxml-xmlstring.html#xmlChar)* ns_uri)

int[xmlXPathHasSameNodes](#xmlXPathHasSameNodes)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

void[xmlXPathIdFunction](#xmlXPathIdFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathIntersection](#xmlXPathIntersection)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

int[xmlXPathIsNodeType](#xmlXPathIsNodeType)(const[xmlChar](libxml-xmlstring.html#xmlChar)* name)

void[xmlXPathLangFunction](#xmlXPathLangFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathLastFunction](#xmlXPathLastFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathLeading](#xmlXPathLeading)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathLeadingSorted](#xmlXPathLeadingSorted)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

void[xmlXPathLocalNameFunction](#xmlXPathLocalNameFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathModValues](#xmlXPathModValues)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

void[xmlXPathMultValues](#xmlXPathMultValues)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

void[xmlXPathNamespaceURIFunction](#xmlXPathNamespaceURIFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathNewBoolean](#xmlXPathNewBoolean)(int val)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathNewCString](#xmlXPathNewCString)(const char * val)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathNewFloat](#xmlXPathNewFloat)(double val)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathNewNodeSet](#xmlXPathNewNodeSet)([xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathNewNodeSetList](#xmlXPathNewNodeSetList)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)val)

[xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)[xmlXPathNewParserContext](#xmlXPathNewParserContext)(const[xmlChar](libxml-xmlstring.html#xmlChar)* str,
[xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathNewString](#xmlXPathNewString)(const[xmlChar](libxml-xmlstring.html#xmlChar)* val)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathNewValueTree](#xmlXPathNewValueTree)([xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextAncestor](#xmlXPathNextAncestor)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextAncestorOrSelf](#xmlXPathNextAncestorOrSelf)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextAttribute](#xmlXPathNextAttribute)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextChild](#xmlXPathNextChild)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextDescendant](#xmlXPathNextDescendant)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextDescendantOrSelf](#xmlXPathNextDescendantOrSelf)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextFollowing](#xmlXPathNextFollowing)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextFollowingSibling](#xmlXPathNextFollowingSibling)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextNamespace](#xmlXPathNextNamespace)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextParent](#xmlXPathNextParent)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextPreceding](#xmlXPathNextPreceding)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextPrecedingSibling](#xmlXPathNextPrecedingSibling)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodePtr](libxml-tree.html#xmlNodePtr)[xmlXPathNextSelf](#xmlXPathNextSelf)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathNodeLeading](#xmlXPathNodeLeading)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)node)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathNodeLeadingSorted](#xmlXPathNodeLeadingSorted)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)node)

int[xmlXPathNodeSetAdd](#xmlXPathNodeSetAdd)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

int[xmlXPathNodeSetAddNs](#xmlXPathNodeSetAddNs)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)node,
[xmlNsPtr](libxml-tree.html#xmlNsPtr)ns)

int[xmlXPathNodeSetAddUnique](#xmlXPathNodeSetAddUnique)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

int[xmlXPathNodeSetContains](#xmlXPathNodeSetContains)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

void[xmlXPathNodeSetDel](#xmlXPathNodeSetDel)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

void[xmlXPathNodeSetFreeNs](#xmlXPathNodeSetFreeNs)([xmlNsPtr](libxml-tree.html#xmlNsPtr)ns)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathNodeSetMerge](#xmlXPathNodeSetMerge)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)val1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)val2)

void[xmlXPathNodeSetRemove](#xmlXPathNodeSetRemove)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
int val)

void[xmlXPathNodeSetSort](#xmlXPathNodeSetSort)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)set)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathNodeTrailing](#xmlXPathNodeTrailing)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)node)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathNodeTrailingSorted](#xmlXPathNodeTrailingSorted)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)node)

void[xmlXPathNormalizeFunction](#xmlXPathNormalizeFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

int[xmlXPathNotEqualValues](#xmlXPathNotEqualValues)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

void[xmlXPathNotFunction](#xmlXPathNotFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

const[xmlChar](libxml-xmlstring.html#xmlChar)*[xmlXPathNsLookup](#xmlXPathNsLookup)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* prefix)

void[xmlXPathNumberFunction](#xmlXPathNumberFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

[xmlChar](libxml-xmlstring.html#xmlChar)*[xmlXPathParseNCName](#xmlXPathParseNCName)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

[xmlChar](libxml-xmlstring.html#xmlChar)*[xmlXPathParseName](#xmlXPathParseName)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

int[xmlXPathPopBoolean](#xmlXPathPopBoolean)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

void *[xmlXPathPopExternal](#xmlXPathPopExternal)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathPopNodeSet](#xmlXPathPopNodeSet)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

double[xmlXPathPopNumber](#xmlXPathPopNumber)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

[xmlChar](libxml-xmlstring.html#xmlChar)*[xmlXPathPopString](#xmlXPathPopString)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

void[xmlXPathPositionFunction](#xmlXPathPositionFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathRegisterAllFunctions](#xmlXPathRegisterAllFunctions)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt)

int[xmlXPathRegisterFunc](#xmlXPathRegisterFunc)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
[xmlXPathFunction](libxml-xpath.html#xmlXPathFunction)f)

void[xmlXPathRegisterFuncLookup](#xmlXPathRegisterFuncLookup)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
[xmlXPathFuncLookupFunc](libxml-xpath.html#xmlXPathFuncLookupFunc)f,
void * funcCtxt)

int[xmlXPathRegisterFuncNS](#xmlXPathRegisterFuncNS)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
const[xmlChar](libxml-xmlstring.html#xmlChar)* ns_uri,
[xmlXPathFunction](libxml-xpath.html#xmlXPathFunction)f)

int[xmlXPathRegisterNs](#xmlXPathRegisterNs)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* prefix,
const[xmlChar](libxml-xmlstring.html#xmlChar)* ns_uri)

int[xmlXPathRegisterVariable](#xmlXPathRegisterVariable)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)value)

void[xmlXPathRegisterVariableLookup](#xmlXPathRegisterVariableLookup)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
[xmlXPathVariableLookupFunc](libxml-xpath.html#xmlXPathVariableLookupFunc)f,
void * data)

int[xmlXPathRegisterVariableNS](#xmlXPathRegisterVariableNS)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
const[xmlChar](libxml-xmlstring.html#xmlChar)* ns_uri,
[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)value)

void[xmlXPathRegisteredFuncsCleanup](#xmlXPathRegisteredFuncsCleanup)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt)

void[xmlXPathRegisteredNsCleanup](#xmlXPathRegisteredNsCleanup)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt)

void[xmlXPathRegisteredVariablesCleanup](#xmlXPathRegisteredVariablesCleanup)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt)

void[xmlXPathRoot](#xmlXPathRoot)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

void[xmlXPathRoundFunction](#xmlXPathRoundFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathStartsWithFunction](#xmlXPathStartsWithFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

double[xmlXPathStringEvalNumber](#xmlXPathStringEvalNumber)(const[xmlChar](libxml-xmlstring.html#xmlChar)* str)

void[xmlXPathStringFunction](#xmlXPathStringFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathStringLengthFunction](#xmlXPathStringLengthFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathSubValues](#xmlXPathSubValues)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

void[xmlXPathSubstringAfterFunction](#xmlXPathSubstringAfterFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathSubstringBeforeFunction](#xmlXPathSubstringBeforeFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathSubstringFunction](#xmlXPathSubstringFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathSumFunction](#xmlXPathSumFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathTrailing](#xmlXPathTrailing)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)[xmlXPathTrailingSorted](#xmlXPathTrailingSorted)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

void[xmlXPathTranslateFunction](#xmlXPathTranslateFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathTrueFunction](#xmlXPathTrueFunction)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

void[xmlXPathValueFlipSign](#xmlXPathValueFlipSign)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathVariableLookup](#xmlXPathVariableLookup)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathVariableLookupNS](#xmlXPathVariableLookupNS)([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
const[xmlChar](libxml-xmlstring.html#xmlChar)* ns_uri)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathWrapCString](#xmlXPathWrapCString)(char * val)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathWrapExternal](#xmlXPathWrapExternal)(void * val)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathWrapNodeSet](#xmlXPathWrapNodeSet)([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)val)

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)[xmlXPathWrapString](#xmlXPathWrapString)([xmlChar](libxml-xmlstring.html#xmlChar)* val)

void[xmlXPatherror](#xmlXPatherror)([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
const char * file,
int line,
int no)

Description

Macro: CAST_TO_BOOLEAN

#define CAST_TO_BOOLEAN

Macro to try to cast the value on the top of the XPath stack to a boolean.

Macro: CAST_TO_NUMBER

#define CAST_TO_NUMBER

Macro to try to cast the value on the top of the XPath stack to a number.

Macro: CAST_TO_STRING

#define CAST_TO_STRING

Macro to try to cast the value on the top of the XPath stack to a string.

Macro: CHECK_ARITY

#define CHECK_ARITY

Macro to check that the number of args passed to an XPath function matches.

Macro: CHECK_ERROR

#define CHECK_ERROR

Macro to return from the function if an XPath error was detected.

Macro: CHECK_ERROR0

#define CHECK_ERROR0

Macro to return 0 from the function if an XPath error was detected.

Macro: CHECK_TYPE

#define CHECK_TYPE

Macro to check that the value on top of the XPath stack is of a given type.

Macro: CHECK_TYPE0

#define CHECK_TYPE0

Macro to check that the value on top of the XPath stack is of a given type. Return(0) in case of failure

Macro: XP_ERROR

#define XP_ERROR

Macro to raise an XPath error and return.

Macro: XP_ERROR0

#define XP_ERROR0

Macro to raise an XPath error and return 0.

Macro: xmlXPathCheckError

#define xmlXPathCheckError

Check if an XPath error was raised. Returns true if an error has been raised, false otherwise.

Macro: xmlXPathEmptyNodeSet

#define xmlXPathEmptyNodeSet

Empties a node-set.

Macro: xmlXPathGetContextNode

#define xmlXPathGetContextNode

Get the context node of an XPath context. Returns the context node.

Macro: xmlXPathGetDocument

#define xmlXPathGetDocument

Get the document of an XPath context. Returns the context document.

Macro: xmlXPathGetError

#define xmlXPathGetError

Get the error code of an XPath context. Returns the context error.

Macro: xmlXPathReturnBoolean

#define xmlXPathReturnBoolean

Pushes the boolean @val on the context stack.

Macro: xmlXPathReturnEmptyNodeSet

#define xmlXPathReturnEmptyNodeSet

Pushes an empty node-set on the context stack.

Macro: xmlXPathReturnEmptyString

#define xmlXPathReturnEmptyString

Pushes an empty string on the stack.

Macro: xmlXPathReturnExternal

#define xmlXPathReturnExternal

Pushes user data on the context stack.

Macro: xmlXPathReturnFalse

#define xmlXPathReturnFalse

Pushes false on the context stack.

Macro: xmlXPathReturnNodeSet

#define xmlXPathReturnNodeSet

Pushes the node-set @ns on the context stack.

Macro: xmlXPathReturnNumber

#define xmlXPathReturnNumber

Pushes the double @val on the context stack.

Macro: xmlXPathReturnString

#define xmlXPathReturnString

Pushes the string @str on the context stack.

Macro: xmlXPathReturnTrue

#define xmlXPathReturnTrue

Pushes true on the context stack.

Macro: xmlXPathSetArityError

#define xmlXPathSetArityError

Raises an XPATH_INVALID_ARITY error.

Macro: xmlXPathSetError

#define xmlXPathSetError

Raises an error.

Macro: xmlXPathSetTypeError

#define xmlXPathSetTypeError

Raises an XPATH_INVALID_TYPE error.

Macro: xmlXPathStackIsExternal

#define xmlXPathStackIsExternal

Checks if the current value on the XPath stack is an external object. Returns true if the current object on the stack is an external object.

Macro: xmlXPathStackIsNodeSet

#define xmlXPathStackIsNodeSet

Check if the current value on the XPath stack is a node set or an XSLT value tree. Returns true if the current object on the stack is a node-set.

Function: valuePop

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)valuePop	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Pops the top XPath object from the value stack

| ctxt: | an XPath evaluation context | | Returns: | the XPath object just removed |

Function: valuePush

int	valuePush ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)value)

Pushes a new XPath object on top of the value stack

| ctxt: | an XPath evaluation context | | value: | the XPath object | | Returns: | the number of items on the value stack |

Function: xmlXPathAddValues

void	xmlXPathAddValues ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Implement the add operation on XPath objects: The numeric operators convert their operands to numbers as if by calling the number function.

| ctxt: | the XPath Parser context |

Function: xmlXPathBooleanFunction

void	xmlXPathBooleanFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the boolean() XPath function boolean boolean(object) The boolean function converts its argument to a boolean as follows: - a number is true if and only if it is neither positive or negative zero nor NaN - a node-set is true if and only if it is non-empty - a string is true if and only if its length is non-zero

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathCeilingFunction

void	xmlXPathCeilingFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the ceiling() XPath function number ceiling(number) The ceiling function returns the smallest (closest to negative infinity) number that is not less than the argument and that is an integer.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathCompareValues

int	xmlXPathCompareValues ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int inf,
int strict)

Implement the compare operation on XPath objects: @arg1 < @arg2 (1, 1, ... @arg1 <= @arg2 (1, 0, ... @arg1 > @arg2 (0, 1, ... @arg1 >= @arg2 (0, 0, ... When neither object to be compared is a node-set and the operator is <=, <, >=, >, then the objects are compared by converted both objects to numbers and comparing the numbers according to IEEE 754. The < comparison will be true if and only if the first number is less than the second number. The <= comparison will be true if and only if the first number is less than or equal to the second number. The > comparison will be true if and only if the first number is greater than the second number. The >= comparison will be true if and only if the first number is greater than or equal to the second number.

| ctxt: | the XPath Parser context | | inf: | less than (1) or greater than (0) | | strict: | is the comparison strict | | Returns: | 1 if the comparison succeeded, 0 if it failed |

Function: xmlXPathConcatFunction

void	xmlXPathConcatFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the concat() XPath function string concat(string, string, string*) The concat function returns the concatenation of its arguments.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathContainsFunction

void	xmlXPathContainsFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the contains() XPath function boolean contains(string, string) The contains function returns true if the first argument string contains the second argument string, and otherwise returns false.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathCountFunction

void	xmlXPathCountFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the count() XPath function number count(node-set)

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathDebugDumpCompExpr

void	xmlXPathDebugDumpCompExpr	(FILE * output,
[xmlXPathCompExprPtr](libxml-xpath.html#xmlXPathCompExprPtr)comp,
int depth)

Dumps the tree of the compiled XPath expression.

| output: | the FILE * for the output | | comp: | the precompiled XPath expression | | depth: | the indentation level. |

Function: xmlXPathDebugDumpObject

void	xmlXPathDebugDumpObject (FILE * output,
[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)cur,
int depth)

Dump the content of the object for debugging purposes

| output: | the FILE * to dump the output | | cur: | the object to inspect | | depth: | indentation level |

Function: xmlXPathDifference

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathDifference	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

Implements the EXSLT - Sets difference() function: node-set set:difference (node-set, node-set)

| nodes1: | a node-set | | nodes2: | a node-set | | Returns: | the difference between the two node sets, or nodes1 if nodes2 is empty |

Function: xmlXPathDistinct

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathDistinct	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes)

Implements the EXSLT - Sets distinct() function: node-set set:distinct (node-set) @nodes is sorted by document order, then #exslSetsDistinctSorted is called with the sorted node-set

| nodes: | a node-set | | Returns: | a subset of the nodes contained in @nodes, or @nodes if it is empty |

Function: xmlXPathDistinctSorted

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathDistinctSorted	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes)

Implements the EXSLT - Sets distinct() function: node-set set:distinct (node-set)

| nodes: | a node-set, sorted by document order | | Returns: | a subset of the nodes contained in @nodes, or @nodes if it is empty |

Function: xmlXPathDivValues

void	xmlXPathDivValues ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Implement the div operation on XPath objects @arg1 / @arg2: The numeric operators convert their operands to numbers as if by calling the number function.

| ctxt: | the XPath Parser context |

Function: xmlXPathEqualValues

int	xmlXPathEqualValues ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Implement the equal operation on XPath objects content: @arg1 == @arg2

| ctxt: | the XPath Parser context | | Returns: | 0 or 1 depending on the results of the test. |

Function: xmlXPathErr

void	xmlXPathErr ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int error)

Handle an XPath error

| ctxt: | a XPath parser context | | error: | the error code |

Function: xmlXPathEvalExpr

void	xmlXPathEvalExpr ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Parse and evaluate an XPath expression in the given context, then push the result on the context stack

| ctxt: | the XPath Parser context |

Function: xmlXPathEvaluatePredicateResult

int	xmlXPathEvaluatePredicateResult	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)res)

Evaluate a predicate result for the current node. A PredicateExpr is evaluated by evaluating the Expr and converting the result to a boolean. If the result is a number, the result will be converted to true if the number is equal to the position of the context node in the context node list (as returned by the position function) and will be converted to false otherwise; if the result is not a number, then the result will be converted as if by a call to the boolean function.

| ctxt: | the XPath Parser context | | res: | the Predicate Expression evaluation result | | Returns: | 1 if predicate is true, 0 otherwise |

Function: xmlXPathFalseFunction

void	xmlXPathFalseFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the false() XPath function boolean false()

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathFloorFunction

void	xmlXPathFloorFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the floor() XPath function number floor(number) The floor function returns the largest (closest to positive infinity) number that is not greater than the argument and that is an integer.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathFreeParserContext

void	xmlXPathFreeParserContext	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Free up an xmlXPathParserContext

| ctxt: | the context to free |

Function: xmlXPathFunctionLookup

[xmlXPathFunction](libxml-xpath.html#xmlXPathFunction)xmlXPathFunctionLookup	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name)

Search in the Function array of the context for the given function.

| ctxt: | the XPath context | | name: | the function name | | Returns: | the xmlXPathFunction or NULL if not found |

Function: xmlXPathFunctionLookupNS

[xmlXPathFunction](libxml-xpath.html#xmlXPathFunction)xmlXPathFunctionLookupNS	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
const[xmlChar](libxml-xmlstring.html#xmlChar)* ns_uri)

Search in the Function array of the context for the given function.

| ctxt: | the XPath context | | name: | the function name | | ns_uri: | the function namespace URI | | Returns: | the xmlXPathFunction or NULL if not found |

Function: xmlXPathHasSameNodes

int	xmlXPathHasSameNodes ([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

Implements the EXSLT - Sets has-same-nodes function: boolean set:has-same-node(node-set, node-set)

| nodes1: | a node-set | | nodes2: | a node-set | | Returns: | true (1) if @nodes1 shares any node with @nodes2, false (0) otherwise |

Function: xmlXPathIdFunction

void	xmlXPathIdFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the id() XPath function node-set id(object) The id function selects elements by their unique ID (see [5.2.1 Unique IDs]). When the argument to id is of type node-set, then the result is the union of the result of applying id to the string value of each of the nodes in the argument node-set. When the argument to id is of any other type, the argument is converted to a string as if by a call to the string function; the string is split into a whitespace-separated list of tokens (whitespace is any sequence of characters matching the production S); the result is a node-set containing the elements in the same document as the context node that have a unique ID equal to any of the tokens in the list.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathIntersection

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathIntersection	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

Implements the EXSLT - Sets intersection() function: node-set set:intersection (node-set, node-set)

| nodes1: | a node-set | | nodes2: | a node-set | | Returns: | a node set comprising the nodes that are within both the node sets passed as arguments |

Function: xmlXPathIsNodeType

int	xmlXPathIsNodeType (const[xmlChar](libxml-xmlstring.html#xmlChar)* name)

Is the name given a NodeType one. [38] NodeType ::= 'comment' | 'text' | 'processing-instruction' | 'node'

| name: | a name string | | Returns: | 1 if true 0 otherwise |

Function: xmlXPathLangFunction

void	xmlXPathLangFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the lang() XPath function boolean lang(string) The lang function returns true or false depending on whether the language of the context node as specified by xml:lang attributes is the same as or is a sublanguage of the language specified by the argument string. The language of the context node is determined by the value of the xml:lang attribute on the context node, or, if the context node has no xml:lang attribute, by the value of the xml:lang attribute on the nearest ancestor of the context node that has an xml:lang attribute. If there is no such attribute, then lang

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathLastFunction

void	xmlXPathLastFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the last() XPath function number last() The last function returns the number of nodes in the context node list.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathLeading

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathLeading ([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

Implements the EXSLT - Sets leading() function: node-set set:leading (node-set, node-set) @nodes1 and @nodes2 are sorted by document order, then #exslSetsLeadingSorted is called.

| nodes1: | a node-set | | nodes2: | a node-set | | Returns: | the nodes in @nodes1 that precede the first node in @nodes2 in document order, @nodes1 if @nodes2 is NULL or empty or an empty node-set if @nodes1 doesn't contain @nodes2 |

Function: xmlXPathLeadingSorted

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathLeadingSorted	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

Implements the EXSLT - Sets leading() function: node-set set:leading (node-set, node-set)

| nodes1: | a node-set, sorted by document order | | nodes2: | a node-set, sorted by document order | | Returns: | the nodes in @nodes1 that precede the first node in @nodes2 in document order, @nodes1 if @nodes2 is NULL or empty or an empty node-set if @nodes1 doesn't contain @nodes2 |

Function: xmlXPathLocalNameFunction

void	xmlXPathLocalNameFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the local-name() XPath function string local-name(node-set?) The local-name function returns a string containing the local part of the name of the node in the argument node-set that is first in document order. If the node-set is empty or the first node has no name, an empty string is returned. If the argument is omitted it defaults to the context node.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathModValues

void	xmlXPathModValues ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Implement the mod operation on XPath objects: @arg1 / @arg2 The numeric operators convert their operands to numbers as if by calling the number function.

| ctxt: | the XPath Parser context |

Function: xmlXPathMultValues

void	xmlXPathMultValues ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Implement the multiply operation on XPath objects: The numeric operators convert their operands to numbers as if by calling the number function.

| ctxt: | the XPath Parser context |

Function: xmlXPathNamespaceURIFunction

void	xmlXPathNamespaceURIFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the namespace-uri() XPath function string namespace-uri(node-set?) The namespace-uri function returns a string containing the namespace URI of the expanded name of the node in the argument node-set that is first in document order. If the node-set is empty, the first node has no name, or the expanded name has no namespace URI, an empty string is returned. If the argument is omitted it defaults to the context node.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathNewBoolean

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathNewBoolean	(int val)

Create a new xmlXPathObjectPtr of type boolean and of value @val

| val: | the boolean value | | Returns: | the newly created object. |

Function: xmlXPathNewCString

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathNewCString	(const char * val)

Create a new xmlXPathObjectPtr of type string and of value @val

| val: | the char * value | | Returns: | the newly created object. |

Function: xmlXPathNewFloat

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathNewFloat	(double val)

Create a new xmlXPathObjectPtr of type double and of value @val

| val: | the double value | | Returns: | the newly created object. |

Function: xmlXPathNewNodeSet

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathNewNodeSet	([xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

Create a new xmlXPathObjectPtr of type NodeSet and initialize it with the single Node @val

| val: | the NodePtr value | | Returns: | the newly created object. |

Function: xmlXPathNewNodeSetList

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathNewNodeSetList	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)val)

Create a new xmlXPathObjectPtr of type NodeSet and initialize it with the Nodeset @val

| val: | an existing NodeSet | | Returns: | the newly created object. |

Function: xmlXPathNewParserContext

[xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)xmlXPathNewParserContext	(const[xmlChar](libxml-xmlstring.html#xmlChar)* str,
[xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt)

Create a new xmlXPathParserContext

| str: | the XPath expression | | ctxt: | the XPath context | | Returns: | the xmlXPathParserContext just allocated. |

Function: xmlXPathNewString

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathNewString	(const[xmlChar](libxml-xmlstring.html#xmlChar)* val)

Create a new xmlXPathObjectPtr of type string and of value @val

| val: | the xmlChar * value | | Returns: | the newly created object. |

Function: xmlXPathNewValueTree

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathNewValueTree	([xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

Create a new xmlXPathObjectPtr of type Value Tree (XSLT) and initialize it with the tree root @val

| val: | the NodePtr value | | Returns: | the newly created object. |

Function: xmlXPathNextAncestor

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextAncestor	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "ancestor" direction the ancestor axis contains the ancestors of the context node; the ancestors of the context node consist of the parent of context node and the parent's parent and so on; the nodes are ordered in reverse document order; thus the parent is the first node on the axis, and the parent's parent is the second node on the axis

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextAncestorOrSelf

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextAncestorOrSelf	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "ancestor-or-self" direction he ancestor-or-self axis contains the context node and ancestors of the context node in reverse document order; thus the context node is the first node on the axis, and the context node's parent the second; parent here is defined the same as with the parent axis.

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextAttribute

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextAttribute	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "attribute" direction TODO: support DTD inherited default attributes

| ctxt: | the XPath Parser context | | cur: | the current attribute in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextChild

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextChild	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "child" direction The child axis contains the children of the context node in document order.

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextDescendant

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextDescendant	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "descendant" direction the descendant axis contains the descendants of the context node in document order; a descendant is a child or a child of a child and so on.

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextDescendantOrSelf

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextDescendantOrSelf	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "descendant-or-self" direction the descendant-or-self axis contains the context node and the descendants of the context node in document order; thus the context node is the first node on the axis, and the first child of the context node is the second node on the axis

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextFollowing

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextFollowing	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "following" direction The following axis contains all nodes in the same document as the context node that are after the context node in document order, excluding any descendants and excluding attribute nodes and namespace nodes; the nodes are ordered in document order

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextFollowingSibling

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextFollowingSibling	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "following-sibling" direction The following-sibling axis contains the following siblings of the context node in document order.

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextNamespace

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextNamespace	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "namespace" direction the namespace axis contains the namespace nodes of the context node; the order of nodes on this axis is implementation-defined; the axis will be empty unless the context node is an element We keep the XML namespace node at the end of the list.

| ctxt: | the XPath Parser context | | cur: | the current attribute in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextParent

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextParent	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "parent" direction The parent axis contains the parent of the context node, if there is one.

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextPreceding

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextPreceding	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "preceding" direction the preceding axis contains all nodes in the same document as the context node that are before the context node in document order, excluding any ancestors and excluding attribute nodes and namespace nodes; the nodes are ordered in reverse document order

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextPrecedingSibling

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextPrecedingSibling	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "preceding-sibling" direction The preceding-sibling axis contains the preceding siblings of the context node in reverse document order; the first preceding sibling is first on the axis; the sibling preceding that node is the second on the axis and so on.

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNextSelf

[xmlNodePtr](libxml-tree.html#xmlNodePtr)xmlXPathNextSelf	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)cur)

Traversal function for the "self" direction The self axis contains just the context node itself

| ctxt: | the XPath Parser context | | cur: | the current node in the traversal | | Returns: | the next element following that axis |

Function: xmlXPathNodeLeading

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathNodeLeading	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)node)

Implements the EXSLT - Sets leading() function: node-set set:leading (node-set, node-set) @nodes is sorted by document order, then #exslSetsNodeLeadingSorted is called.

| nodes: | a node-set | | node: | a node | | Returns: | the nodes in @nodes that precede @node in document order, @nodes if @node is NULL or an empty node-set if @nodes doesn't contain @node |

Function: xmlXPathNodeLeadingSorted

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathNodeLeadingSorted	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)node)

Implements the EXSLT - Sets leading() function: node-set set:leading (node-set, node-set)

| nodes: | a node-set, sorted by document order | | node: | a node | | Returns: | the nodes in @nodes that precede @node in document order, @nodes if @node is NULL or an empty node-set if @nodes doesn't contain @node |

Function: xmlXPathNodeSetAdd

int	xmlXPathNodeSetAdd ([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

add a new xmlNodePtr to an existing NodeSet

| cur: | the initial node set | | val: | a new xmlNodePtr | | Returns: | 0 in case of success, and -1 in case of error |

Function: xmlXPathNodeSetAddNs

int	xmlXPathNodeSetAddNs ([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)node,
[xmlNsPtr](libxml-tree.html#xmlNsPtr)ns)

add a new namespace node to an existing NodeSet

| cur: | the initial node set | | node: | the hosting node | | ns: | a the namespace node | | Returns: | 0 in case of success and -1 in case of error |

Function: xmlXPathNodeSetAddUnique

int	xmlXPathNodeSetAddUnique	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

add a new xmlNodePtr to an existing NodeSet, optimized version when we are sure the node is not already in the set.

| cur: | the initial node set | | val: | a new xmlNodePtr | | Returns: | 0 in case of success and -1 in case of failure |

Function: xmlXPathNodeSetContains

int	xmlXPathNodeSetContains ([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

checks whether @cur contains @val

| cur: | the node-set | | val: | the node | | Returns: | true (1) if @cur contains @val, false (0) otherwise |

Function: xmlXPathNodeSetDel

void	xmlXPathNodeSetDel ([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)val)

Removes an xmlNodePtr from an existing NodeSet

| cur: | the initial node set | | val: | an xmlNodePtr |

Function: xmlXPathNodeSetFreeNs

void	xmlXPathNodeSetFreeNs ([xmlNsPtr](libxml-tree.html#xmlNsPtr)ns)

Namespace nodes in libxml don't match the XPath semantic. In a node set the namespace nodes are duplicated and the next pointer is set to the parent node in the XPath semantic. Check if such a node needs to be freed

| ns: | the XPath namespace node found in a nodeset. |

Function: xmlXPathNodeSetMerge

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathNodeSetMerge	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)val1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)val2)

Merges two nodesets, all nodes from @val2 are added to @val1 if @val1 is NULL, a new set is created and copied from @val2

| val1: | the first NodeSet or NULL | | val2: | the second NodeSet | | Returns: | @val1 once extended or NULL in case of error. |

Function: xmlXPathNodeSetRemove

void	xmlXPathNodeSetRemove ([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)cur,
int val)

Removes an entry from an existing NodeSet list.

| cur: | the initial node set | | val: | the index to remove |

Function: xmlXPathNodeSetSort

void	xmlXPathNodeSetSort ([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)set)

Sort the node set in document order

| set: | the node set |

Function: xmlXPathNodeTrailing

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathNodeTrailing	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)node)

Implements the EXSLT - Sets trailing() function: node-set set:trailing (node-set, node-set) @nodes is sorted by document order, then #xmlXPathNodeTrailingSorted is called.

| nodes: | a node-set | | node: | a node | | Returns: | the nodes in @nodes that follow @node in document order, @nodes if @node is NULL or an empty node-set if @nodes doesn't contain @node |

Function: xmlXPathNodeTrailingSorted

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathNodeTrailingSorted	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes,
[xmlNodePtr](libxml-tree.html#xmlNodePtr)node)

Implements the EXSLT - Sets trailing() function: node-set set:trailing (node-set, node-set)

| nodes: | a node-set, sorted by document order | | node: | a node | | Returns: | the nodes in @nodes that follow @node in document order, @nodes if @node is NULL or an empty node-set if @nodes doesn't contain @node |

Function: xmlXPathNormalizeFunction

void	xmlXPathNormalizeFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the normalize-space() XPath function string normalize-space(string?) The normalize-space function returns the argument string with white space normalized by stripping leading and trailing whitespace and replacing sequences of whitespace characters by a single space. Whitespace characters are the same allowed by the S production in XML. If the argument is omitted, it defaults to the context node converted to a string, in other words the value of the context node.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathNotEqualValues

int	xmlXPathNotEqualValues ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Implement the equal operation on XPath objects content: @arg1 == @arg2

| ctxt: | the XPath Parser context | | Returns: | 0 or 1 depending on the results of the test. |

Function: xmlXPathNotFunction

void	xmlXPathNotFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the not() XPath function boolean not(boolean) The not function returns true if its argument is false, and false otherwise.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathNsLookup

const[xmlChar](libxml-xmlstring.html#xmlChar)*	xmlXPathNsLookup	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* prefix)

Search in the namespace declaration array of the context for the given namespace name associated to the given prefix

| ctxt: | the XPath context | | prefix: | the namespace prefix value | | Returns: | the value or NULL if not found |

Function: xmlXPathNumberFunction

void	xmlXPathNumberFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the number() XPath function number number(object?)

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathParseNCName

[xmlChar](libxml-xmlstring.html#xmlChar)*	xmlXPathParseNCName	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

parse an XML namespace non qualified name. [NS 3] NCName ::= (Letter | '_') (NCNameChar)* [NS 4] NCNameChar ::= Letter | Digit | '.' | '-' | '_' | CombiningChar | Extender

| ctxt: | the XPath Parser context | | Returns: | the namespace name or NULL |

Function: xmlXPathParseName

[xmlChar](libxml-xmlstring.html#xmlChar)*	xmlXPathParseName	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

parse an XML name [4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender [5] Name ::= (Letter | '_' | ':') (NameChar)*

| ctxt: | the XPath Parser context | | Returns: | the namespace name or NULL |

Function: xmlXPathPopBoolean

int	xmlXPathPopBoolean ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Pops a boolean from the stack, handling conversion if needed. Check error with #xmlXPathCheckError.

| ctxt: | an XPath parser context | | Returns: | the boolean |

Function: xmlXPathPopExternal

void *	xmlXPathPopExternal ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Pops an external object from the stack, handling conversion if needed. Check error with #xmlXPathCheckError.

| ctxt: | an XPath parser context | | Returns: | the object |

Function: xmlXPathPopNodeSet

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathPopNodeSet	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Pops a node-set from the stack, handling conversion if needed. Check error with #xmlXPathCheckError.

| ctxt: | an XPath parser context | | Returns: | the node-set |

Function: xmlXPathPopNumber

double	xmlXPathPopNumber ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Pops a number from the stack, handling conversion if needed. Check error with #xmlXPathCheckError.

| ctxt: | an XPath parser context | | Returns: | the number |

Function: xmlXPathPopString

[xmlChar](libxml-xmlstring.html#xmlChar)*	xmlXPathPopString	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Pops a string from the stack, handling conversion if needed. Check error with #xmlXPathCheckError.

| ctxt: | an XPath parser context | | Returns: | the string |

Function: xmlXPathPositionFunction

void	xmlXPathPositionFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the position() XPath function number position() The position function returns the position of the context node in the context node list. The first position is 1, and so the last position will be equal to last().

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathRegisterAllFunctions

void	xmlXPathRegisterAllFunctions	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt)

Registers all default XPath functions in this context

| ctxt: | the XPath context |

Function: xmlXPathRegisterFunc

int	xmlXPathRegisterFunc ([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
[xmlXPathFunction](libxml-xpath.html#xmlXPathFunction)f)

Register a new function. If @f is NULL it unregisters the function

| ctxt: | the XPath context | | name: | the function name | | f: | the function implementation or NULL | | Returns: | 0 in case of success, -1 in case of error |

Function: xmlXPathRegisterFuncLookup

void	xmlXPathRegisterFuncLookup	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
[xmlXPathFuncLookupFunc](libxml-xpath.html#xmlXPathFuncLookupFunc)f,
void * funcCtxt)

Registers an external mechanism to do function lookup.

| ctxt: | the XPath context | | f: | the lookup function | | funcCtxt: | the lookup data |

Function: xmlXPathRegisterFuncNS

int	xmlXPathRegisterFuncNS ([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
const[xmlChar](libxml-xmlstring.html#xmlChar)* ns_uri,
[xmlXPathFunction](libxml-xpath.html#xmlXPathFunction)f)

Register a new function. If @f is NULL it unregisters the function

| ctxt: | the XPath context | | name: | the function name | | ns_uri: | the function namespace URI | | f: | the function implementation or NULL | | Returns: | 0 in case of success, -1 in case of error |

Function: xmlXPathRegisterNs

int	xmlXPathRegisterNs ([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* prefix,
const[xmlChar](libxml-xmlstring.html#xmlChar)* ns_uri)

Register a new namespace. If @ns_uri is NULL it unregisters the namespace

| ctxt: | the XPath context | | prefix: | the namespace prefix cannot be NULL or empty string | | ns_uri: | the namespace name | | Returns: | 0 in case of success, -1 in case of error |

Function: xmlXPathRegisterVariable

int	xmlXPathRegisterVariable	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)value)

Register a new variable value. If @value is NULL it unregisters the variable

| ctxt: | the XPath context | | name: | the variable name | | value: | the variable value or NULL | | Returns: | 0 in case of success, -1 in case of error |

Function: xmlXPathRegisterVariableLookup

void	xmlXPathRegisterVariableLookup	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
[xmlXPathVariableLookupFunc](libxml-xpath.html#xmlXPathVariableLookupFunc)f,
void * data)

register an external mechanism to do variable lookup

| ctxt: | the XPath context | | f: | the lookup function | | data: | the lookup data |

Function: xmlXPathRegisterVariableNS

int	xmlXPathRegisterVariableNS	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
const[xmlChar](libxml-xmlstring.html#xmlChar)* ns_uri,
[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)value)

Register a new variable value. If @value is NULL it unregisters the variable

| ctxt: | the XPath context | | name: | the variable name | | ns_uri: | the variable namespace URI | | value: | the variable value or NULL | | Returns: | 0 in case of success, -1 in case of error |

Function: xmlXPathRegisteredFuncsCleanup

void	xmlXPathRegisteredFuncsCleanup	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt)

Cleanup the XPath context data associated to registered functions

| ctxt: | the XPath context |

Function: xmlXPathRegisteredNsCleanup

void	xmlXPathRegisteredNsCleanup	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt)

Cleanup the XPath context data associated to registered variables

| ctxt: | the XPath context |

Function: xmlXPathRegisteredVariablesCleanup

void	xmlXPathRegisteredVariablesCleanup	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt)

Cleanup the XPath context data associated to registered variables

| ctxt: | the XPath context |

Function: xmlXPathRoot

void	xmlXPathRoot ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Initialize the context to the root of the document

| ctxt: | the XPath Parser context |

Function: xmlXPathRoundFunction

void	xmlXPathRoundFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the round() XPath function number round(number) The round function returns the number that is closest to the argument and that is an integer. If there are two such numbers, then the one that is even is returned.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathStartsWithFunction

void	xmlXPathStartsWithFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the starts-with() XPath function boolean starts-with(string, string) The starts-with function returns true if the first argument string starts with the second argument string, and otherwise returns false.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathStringEvalNumber

double	xmlXPathStringEvalNumber	(const[xmlChar](libxml-xmlstring.html#xmlChar)* str)

[30a] Float ::= Number ('e' Digits?)? [30] Number ::= Digits ('.' Digits?)? | '.' Digits [31] Digits ::= [0-9]+ Compile a Number in the string In complement of the Number expression, this function also handles negative values : '-' Number.

| str: | A string to scan | | Returns: | the double value. |

Function: xmlXPathStringFunction

void	xmlXPathStringFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the string() XPath function string string(object?) The string function converts an object to a string as follows: - A node-set is converted to a string by returning the value of the node in the node-set that is first in document order. If the node-set is empty, an empty string is returned. - A number is converted to a string as follows + NaN is converted to the string NaN + positive zero is converted to the string 0 + negative zero is converted to the string 0 + positive infinity is converted to the string Infinity + negative infinity is converted to the string -Infinity + if the number is an integer, the number is represented in decimal form as a Number with no decimal point and no leading zeros, preceded by a minus sign (-) if the number is negative + otherwise, the number is represented in decimal form as a Number including a decimal point with at least one digit before the decimal point and at least one digit after the decimal point, preceded by a minus sign (-) if the number is negative; there must be no leading zeros before the decimal point apart possibly from the one required digit immediately before the decimal point; beyond the one required digit after the decimal point there must be as many, but only as many, more digits as are needed to uniquely distinguish the number from all other IEEE 754 numeric values. - The boolean false value is converted to the string false. The boolean true value is converted to the string true. If the argument is omitted, it defaults to a node-set with the context node as its only member.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathStringLengthFunction

void	xmlXPathStringLengthFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the string-length() XPath function number string-length(string?) The string-length returns the number of characters in the string (see [3.6 Strings]). If the argument is omitted, it defaults to the context node converted to a string, in other words the value of the context node.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathSubValues

void	xmlXPathSubValues ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Implement the subtraction operation on XPath objects: The numeric operators convert their operands to numbers as if by calling the number function.

| ctxt: | the XPath Parser context |

Function: xmlXPathSubstringAfterFunction

void	xmlXPathSubstringAfterFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the substring-after() XPath function string substring-after(string, string) The substring-after function returns the substring of the first argument string that follows the first occurrence of the second argument string in the first argument string, or the empty stringi if the first argument string does not contain the second argument string. For example, substring-after("1999/04/01","/") returns 04/01, and substring-after("1999/04/01","19") returns 99/04/01.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathSubstringBeforeFunction

void	xmlXPathSubstringBeforeFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the substring-before() XPath function string substring-before(string, string) The substring-before function returns the substring of the first argument string that precedes the first occurrence of the second argument string in the first argument string, or the empty string if the first argument string does not contain the second argument string. For example, substring-before("1999/04/01","/") returns 1999.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathSubstringFunction

void	xmlXPathSubstringFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the substring() XPath function string substring(string, number, number?) The substring function returns the substring of the first argument starting at the position specified in the second argument with length specified in the third argument. For example, substring("12345",2,3) returns "234". If the third argument is not specified, it returns the substring starting at the position specified in the second argument and continuing to the end of the string. For example, substring("12345",2) returns "2345". More precisely, each character in the string (see [3.6 Strings]) is considered to have a numeric position: the position of the first character is 1, the position of the second character is 2 and so on. The returned substring contains those characters for which the position of the character is greater than or equal to the second argument and, if the third argument is specified, less than the sum of the second and third arguments; the comparisons and addition used for the above follow the standard IEEE 754 rules. Thus: - substring("12345", 1.5, 2.6) returns "234" - substring("12345", 0, 3) returns "12" - substring("12345", 0 div 0, 3) returns "" - substring("12345", 1, 0 div 0) returns "" - substring("12345", -42, 1 div 0) returns "12345" - substring("12345", -1 div 0, 1 div 0) returns ""

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathSumFunction

void	xmlXPathSumFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the sum() XPath function number sum(node-set) The sum function returns the sum of the values of the nodes in the argument node-set.

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathTrailing

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathTrailing	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

Implements the EXSLT - Sets trailing() function: node-set set:trailing (node-set, node-set) @nodes1 and @nodes2 are sorted by document order, then #xmlXPathTrailingSorted is called.

| nodes1: | a node-set | | nodes2: | a node-set | | Returns: | the nodes in @nodes1 that follow the first node in @nodes2 in document order, @nodes1 if @nodes2 is NULL or empty or an empty node-set if @nodes1 doesn't contain @nodes2 |

Function: xmlXPathTrailingSorted

[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)xmlXPathTrailingSorted	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes1,
[xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)nodes2)

Implements the EXSLT - Sets trailing() function: node-set set:trailing (node-set, node-set)

| nodes1: | a node-set, sorted by document order | | nodes2: | a node-set, sorted by document order | | Returns: | the nodes in @nodes1 that follow the first node in @nodes2 in document order, @nodes1 if @nodes2 is NULL or empty or an empty node-set if @nodes1 doesn't contain @nodes2 |

Function: xmlXPathTranslateFunction

void	xmlXPathTranslateFunction	([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the translate() XPath function string translate(string, string, string) The translate function returns the first argument string with occurrences of characters in the second argument string replaced by the character at the corresponding position in the third argument string. For example, translate("bar","abc","ABC") returns the string BAr. If there is a character in the second argument string with no character at a corresponding position in the third argument string (because the second argument string is longer than the third argument string), then occurrences of that character in the first argument string are removed. For example, translate("--aaa--","abc-","ABC")

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathTrueFunction

void	xmlXPathTrueFunction ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
int nargs)

Implement the true() XPath function boolean true()

| ctxt: | the XPath Parser context | | nargs: | the number of arguments |

Function: xmlXPathValueFlipSign

void	xmlXPathValueFlipSign ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt)

Implement the unary - operation on an XPath object The numeric operators convert their operands to numbers as if by calling the number function.

| ctxt: | the XPath Parser context |

Function: xmlXPathVariableLookup

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathVariableLookup	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name)

Search in the Variable array of the context for the given variable value.

| ctxt: | the XPath context | | name: | the variable name | | Returns: | a copy of the value or NULL if not found |

Function: xmlXPathVariableLookupNS

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathVariableLookupNS	([xmlXPathContextPtr](libxml-xpath.html#xmlXPathContextPtr)ctxt,
const[xmlChar](libxml-xmlstring.html#xmlChar)* name,
const[xmlChar](libxml-xmlstring.html#xmlChar)* ns_uri)

Search in the Variable array of the context for the given variable value.

| ctxt: | the XPath context | | name: | the variable name | | ns_uri: | the variable namespace URI | | Returns: | the a copy of the value or NULL if not found |

Function: xmlXPathWrapCString

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathWrapCString	(char * val)

Wraps a string into an XPath object.

| val: | the char * value | | Returns: | the newly created object. |

Function: xmlXPathWrapExternal

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathWrapExternal	(void * val)

Wraps the @val data into an XPath object.

| val: | the user data | | Returns: | the newly created object. |

Function: xmlXPathWrapNodeSet

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathWrapNodeSet	([xmlNodeSetPtr](libxml-xpath.html#xmlNodeSetPtr)val)

Wrap the Nodeset @val in a new xmlXPathObjectPtr

| val: | the NodePtr value | | Returns: | the newly created object. |

Function: xmlXPathWrapString

[xmlXPathObjectPtr](libxml-xpath.html#xmlXPathObjectPtr)xmlXPathWrapString	([xmlChar](libxml-xmlstring.html#xmlChar)* val)

Wraps the @val string into an XPath object.

| val: | the xmlChar * value | | Returns: | the newly created object. |

Function: xmlXPatherror

void	xmlXPatherror ([xmlXPathParserContextPtr](libxml-xpath.html#xmlXPathParserContextPtr)ctxt,
const char * file,
int line,
int no)

Formats an error message.

| ctxt: | the XPath Parser context | | file: | the file name | | line: | the line number | | no: | the error number |

Daniel Veillard

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