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<head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <title>xpathInternals: internal interfaces for XML Path Language implementation</title> <meta name="generator" content="Libxml2 devhelp stylesheet"/> <link rel="start" href="index.html" title="libxml2 Reference Manual"/> <link rel="up" href="general.html" title="API"/> <link rel="stylesheet" href="style.css" type="text/css"/> <link rel="chapter" href="general.html" title="API"/> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"> <tr valign="middle"> <td> <a accesskey="p" href="libxml2-xpath.html"> <img src="left.png" width="24" height="24" border="0" alt="Prev"/> </a> </td> <td> <a accesskey="u" href="general.html"> <img src="up.png" width="24" height="24" border="0" alt="Up"/> </a> </td> <td> <a accesskey="h" href="index.html"> <img src="home.png" width="24" height="24" border="0" alt="Home"/> </a> </td> <td> <a accesskey="n" href="libxml2-xpointer.html"> <img src="right.png" width="24" height="24" border="0" alt="Next"/> </a> </td> <th width="100%" align="center">libxml2 Reference Manual</th> </tr> </table> <h2> <span class="refentrytitle">xpathInternals</span> </h2> <p>xpathInternals - internal interfaces for XML Path Language implementation</p> <p>internal interfaces for XML Path Language implementation used to build new modules on top of XPath like XPointer and XSLT </p> <p>Author(s): Daniel Veillard </p> <div class="refsynopsisdiv"> <h2>Synopsis</h2> <pre class="synopsis">#define <a href="#xmlXPathStackIsExternal">xmlXPathStackIsExternal</a>(ctxt);
define <a href=“#xmlXPathReturnEmptyString”>xmlXPathReturnEmptyString</a>(ctxt); define <a href=“#XP_ERROR0”>XP_ERROR0</a>(X); define <a href=“#xmlXPathSetTypeError”>xmlXPathSetTypeError</a>(ctxt); define <a href=“#xmlXPathReturnEmptyNodeSet”>xmlXPathReturnEmptyNodeSet</a>(ctxt); define <a href=“#xmlXPathReturnTrue”>xmlXPathReturnTrue</a>(ctxt); define <a href=“#xmlXPathReturnBoolean”>xmlXPathReturnBoolean</a>(ctxt, val); define <a href=“#xmlXPathGetContextNode”>xmlXPathGetContextNode</a>(ctxt); define <a href=“#CAST_TO_NUMBER”>CAST_TO_NUMBER</a>; define <a href=“#CHECK_ARITY”>CHECK_ARITY</a>(x); define <a href=“#CHECK_TYPE0”>CHECK_TYPE0</a>(typeval); define <a href=“#CAST_TO_STRING”>CAST_TO_STRING</a>; define <a href=“#xmlXPathReturnExternal”>xmlXPathReturnExternal</a>(ctxt, val); define <a href=“#xmlXPathStackIsNodeSet”>xmlXPathStackIsNodeSet</a>(ctxt); define <a href=“#xmlXPathCheckError”>xmlXPathCheckError</a>(ctxt); define <a href=“#xmlXPathSetError”>xmlXPathSetError</a>(ctxt, err); define <a href=“#CHECK_ERROR”>CHECK_ERROR</a>; define <a href=“#xmlXPathReturnString”>xmlXPathReturnString</a>(ctxt, str); define <a href=“#CAST_TO_BOOLEAN”>CAST_TO_BOOLEAN</a>; define <a href=“#xmlXPathSetArityError”>xmlXPathSetArityError</a>(ctxt); define <a href=“#CHECK_TYPE”>CHECK_TYPE</a>(typeval); define <a href=“#xmlXPathReturnFalse”>xmlXPathReturnFalse</a>(ctxt); define <a href=“#xmlXPathReturnNumber”>xmlXPathReturnNumber</a>(ctxt, val); define <a href=“#CHECK_ERROR0”>CHECK_ERROR0</a>; define <a href=“#xmlXPathGetDocument”>xmlXPathGetDocument</a>(ctxt); define <a href=“#xmlXPathGetError”>xmlXPathGetError</a>(ctxt); define <a href=“#XP_ERROR”>XP_ERROR</a>(X); define <a href=“#xmlXPathEmptyNodeSet”>xmlXPathEmptyNodeSet</a>(ns); define <a href=“#xmlXPathReturnNodeSet”>xmlXPathReturnNodeSet</a>(ctxt, ns); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathNodeSetMerge”>xmlXPathNodeSetMerge</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> val1, <br/> <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> val2); void <a href=“#xmlXPathNumberFunction”>xmlXPathNumberFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * <a href=“#xmlXPathNsLookup”>xmlXPathNsLookup</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * prefix); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathNewNodeSet”>xmlXPathNewNodeSet</a> (<a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> val); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextAncestorOrSelf”>xmlXPathNextAncestorOrSelf</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); void <a href=“#xmlXPathNodeSetRemove”>xmlXPathNodeSetRemove</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> cur, <br/> int val); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathNewNodeSetList”>xmlXPathNewNodeSetList</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> val); int <a href=“#xmlXPathPopBoolean”>xmlXPathPopBoolean</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathNewString”>xmlXPathNewString</a> (const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * val); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathNodeLeadingSorted”>xmlXPathNodeLeadingSorted</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> node); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextChild”>xmlXPathNextChild</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextFollowingSibling”>xmlXPathNextFollowingSibling</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * <a href=“#xmlXPathPopString”>xmlXPathPopString</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); void <a href=“#xmlXPathNamespaceURIFunction”>xmlXPathNamespaceURIFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); int <a href=“#xmlXPathCompareValues”>xmlXPathCompareValues</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int inf, <br/> int strict); void <a href=“#xmlXPathConcatFunction”>xmlXPathConcatFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); int <a href=“#xmlXPathNodeSetContains”>xmlXPathNodeSetContains</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> cur, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> val); void <a href=“#xmlXPatherror”>xmlXPatherror</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> const char * file, <br/> int line, <br/> int no); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextAncestor”>xmlXPathNextAncestor</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); void <a href=“#xmlXPathBooleanFunction”>xmlXPathBooleanFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathRoot”>xmlXPathRoot</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); void <a href=“#xmlXPathRegisteredNsCleanup”>xmlXPathRegisteredNsCleanup</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt); int <a href=“#xmlXPathIsNodeType”>xmlXPathIsNodeType</a> (const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextFollowing”>xmlXPathNextFollowing</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); void <a href=“#xmlXPathAddValues”>xmlXPathAddValues</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); int <a href=“#xmlXPathRegisterVariable”>xmlXPathRegisterVariable</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> value); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#valuePop”>valuePop</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); void <a href=“#xmlXPathCeilingFunction”>xmlXPathCeilingFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathIntersection”>xmlXPathIntersection</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes1, <br/> <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes2); void <a href=“#xmlXPathContainsFunction”>xmlXPathContainsFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathNodeSetSort”>xmlXPathNodeSetSort</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> set); void <a href=“#xmlXPathStartsWithFunction”>xmlXPathStartsWithFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathNodeLeading”>xmlXPathNodeLeading</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> node); void <a href=“#xmlXPathSumFunction”>xmlXPathSumFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); int <a href=“#xmlXPathNotEqualValues”>xmlXPathNotEqualValues</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); int <a href=“#xmlXPathEvaluatePredicateResult”>xmlXPathEvaluatePredicateResult</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> res); void <a href=“#xmlXPathErr”>xmlXPathErr</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int error); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextPreceding”>xmlXPathNextPreceding</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); <a href=“libxml2-xpath.html#xmlXPathFunction”>xmlXPathFunction</a> <a href=“#xmlXPathFunctionLookupNS”>xmlXPathFunctionLookupNS</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * ns_uri); void <a href=“#xmlXPathRegisteredFuncsCleanup”>xmlXPathRegisteredFuncsCleanup</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt); void <a href=“#xmlXPathRegisterAllFunctions”>xmlXPathRegisterAllFunctions</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt); <a href=“libxml2-xpath.html#xmlXPathFunction”>xmlXPathFunction</a> <a href=“#xmlXPathFunctionLookup”>xmlXPathFunctionLookup</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name); void <a href=“#xmlXPathPositionFunction”>xmlXPathPositionFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathSubstringBeforeFunction”>xmlXPathSubstringBeforeFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathRegisteredVariablesCleanup”>xmlXPathRegisteredVariablesCleanup</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathNewFloat”>xmlXPathNewFloat</a> (double val); int <a href=“#xmlXPathRegisterNs”>xmlXPathRegisterNs</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * prefix, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * ns_uri); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextParent”>xmlXPathNextParent</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); void <a href=“#xmlXPathNodeSetFreeNs”>xmlXPathNodeSetFreeNs</a> (<a href=“libxml2-tree.html#xmlNsPtr”>xmlNsPtr</a> ns); int <a href=“#xmlXPathHasSameNodes”>xmlXPathHasSameNodes</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes1, <br/> <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes2); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathDistinctSorted”>xmlXPathDistinctSorted</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes); int <a href=“#valuePush”>valuePush</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> value); void <a href=“#xmlXPathSubstringFunction”>xmlXPathSubstringFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathStringFunction”>xmlXPathStringFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathFloorFunction”>xmlXPathFloorFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathIdFunction”>xmlXPathIdFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathLastFunction”>xmlXPathLastFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathStringLengthFunction”>xmlXPathStringLengthFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextSelf”>xmlXPathNextSelf</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); void <a href=“#xmlXPathDebugDumpCompExpr”>xmlXPathDebugDumpCompExpr</a> (FILE * output, <br/> <a href=“libxml2-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a> comp, <br/> int depth); void <a href=“#xmlXPathFalseFunction”>xmlXPathFalseFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathValueFlipSign”>xmlXPathValueFlipSign</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); void <a href=“#xmlXPathTranslateFunction”>xmlXPathTranslateFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathRegisterFuncLookup”>xmlXPathRegisterFuncLookup</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> <a href=“libxml2-xpath.html#xmlXPathFuncLookupFunc”>xmlXPathFuncLookupFunc</a> f, <br/> void * funcCtxt); double <a href=“#xmlXPathPopNumber”>xmlXPathPopNumber</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); void <a href=“#xmlXPathRoundFunction”>xmlXPathRoundFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathPopNodeSet”>xmlXPathPopNodeSet</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); void <a href=“#xmlXPathCountFunction”>xmlXPathCountFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * <a href=“#xmlXPathParseNCName”>xmlXPathParseNCName</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); void <a href=“#xmlXPathTrueFunction”>xmlXPathTrueFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathNewBoolean”>xmlXPathNewBoolean</a> (int val); void <a href=“#xmlXPathSubValues”>xmlXPathSubValues</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); int <a href=“#xmlXPathEqualValues”>xmlXPathEqualValues</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathTrailingSorted”>xmlXPathTrailingSorted</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes1, <br/> <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes2); void <a href=“#xmlXPathMultValues”>xmlXPathMultValues</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); void <a href=“#xmlXPathModValues”>xmlXPathModValues</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); <a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> <a href=“#xmlXPathNewParserContext”>xmlXPathNewParserContext</a> (const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * str, <br/> <a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathWrapNodeSet”>xmlXPathWrapNodeSet</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> val); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathWrapString”>xmlXPathWrapString</a> (<a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * val); void <a href=“#xmlXPathLangFunction”>xmlXPathLangFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); int <a href=“#xmlXPathRegisterFuncNS”>xmlXPathRegisterFuncNS</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * ns_uri, <br/> <a href=“libxml2-xpath.html#xmlXPathFunction”>xmlXPathFunction</a> f); int <a href=“#xmlXPathNodeSetAddNs”>xmlXPathNodeSetAddNs</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> cur, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> node, <br/> <a href=“libxml2-tree.html#xmlNsPtr”>xmlNsPtr</a> ns); void <a href=“#xmlXPathLocalNameFunction”>xmlXPathLocalNameFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathDifference”>xmlXPathDifference</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes1, <br/> <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes2); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathLeadingSorted”>xmlXPathLeadingSorted</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes1, <br/> <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes2); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextPrecedingSibling”>xmlXPathNextPrecedingSibling</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); void * <a href=“#xmlXPathPopExternal”>xmlXPathPopExternal</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); void <a href=“#xmlXPathNormalizeFunction”>xmlXPathNormalizeFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); void <a href=“#xmlXPathRegisterVariableLookup”>xmlXPathRegisterVariableLookup</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> <a href=“libxml2-xpath.html#xmlXPathVariableLookupFunc”>xmlXPathVariableLookupFunc</a> f, <br/> void * data); void <a href=“#xmlXPathNodeSetDel”>xmlXPathNodeSetDel</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> cur, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> val); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathNodeTrailingSorted”>xmlXPathNodeTrailingSorted</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> node); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathNewCString”>xmlXPathNewCString</a> (const char * val); int <a href=“#xmlXPathRegisterFunc”>xmlXPathRegisterFunc</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> <a href=“libxml2-xpath.html#xmlXPathFunction”>xmlXPathFunction</a> f); void <a href=“#xmlXPathSubstringAfterFunction”>xmlXPathSubstringAfterFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextDescendant”>xmlXPathNextDescendant</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextNamespace”>xmlXPathNextNamespace</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathWrapCString”>xmlXPathWrapCString</a> (char * val); void <a href=“#xmlXPathFreeParserContext”>xmlXPathFreeParserContext</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathNodeTrailing”>xmlXPathNodeTrailing</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> node); int <a href=“#xmlXPathNodeSetAdd”>xmlXPathNodeSetAdd</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> cur, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> val); int <a href=“#xmlXPathNodeSetAddUnique”>xmlXPathNodeSetAddUnique</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> cur, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> val); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathNewValueTree”>xmlXPathNewValueTree</a> (<a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> val); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathDistinct”>xmlXPathDistinct</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathVariableLookup”>xmlXPathVariableLookup</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name); void <a href=“#xmlXPathNotFunction”>xmlXPathNotFunction</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> int nargs); double <a href=“#xmlXPathStringEvalNumber”>xmlXPathStringEvalNumber</a> (const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * str); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextDescendantOrSelf”>xmlXPathNextDescendantOrSelf</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathWrapExternal”>xmlXPathWrapExternal</a> (void * val); <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> <a href=“#xmlXPathNextAttribute”>xmlXPathNextAttribute</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br/> <a href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> cur); void <a href=“#xmlXPathDivValues”>xmlXPathDivValues</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathVariableLookupNS”>xmlXPathVariableLookupNS</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * ns_uri); int <a href=“#xmlXPathRegisterVariableNS”>xmlXPathRegisterVariableNS</a> (<a href=“libxml2-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * ns_uri, <br/> <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> value); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathTrailing”>xmlXPathTrailing</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes1, <br/> <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes2); void <a href=“#xmlXPathEvalExpr”>xmlXPathEvalExpr</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); void <a href=“#xmlXPathDebugDumpObject”>xmlXPathDebugDumpObject</a> (FILE * output, <br/> <a href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> cur, <br/> int depth); <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathLeading”>xmlXPathLeading</a> (<a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes1, <br/> <a href=“libxml2-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> nodes2); <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * <a href=“#xmlXPathParseName”>xmlXPathParseName</a> (<a href=“libxml2-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt); </pre>
</div> <div class="refsect1" lang="en"> <h2>Description</h2> </div> <div class="refsect1" lang="en"> <h2>Details</h2> <div class="refsect2" lang="en"> <div class="refsect2" lang="en"><h3><a name="CAST_TO_BOOLEAN">Macro </a>CAST_TO_BOOLEAN</h3><pre class="programlisting">#define <a href="#CAST_TO_BOOLEAN">CAST_TO_BOOLEAN</a>;
</pre><p>Macro to try to cast the value on the top of the XPath stack to a boolean.</p> </div>
<hr/> <div class="refsect2" lang="en"><h3><a name="CAST_TO_NUMBER">Macro </a>CAST_TO_NUMBER</h3><pre class="programlisting">#define <a href="#CAST_TO_NUMBER">CAST_TO_NUMBER</a>;
</pre><p>Macro to try to cast the value on the top of the XPath stack to a number.</p> </div>
<hr/> <div class="refsect2" lang="en"><h3><a name="CAST_TO_STRING">Macro </a>CAST_TO_STRING</h3><pre class="programlisting">#define <a href="#CAST_TO_STRING">CAST_TO_STRING</a>;
</pre><p>Macro to try to cast the value on the top of the XPath stack to a string.</p> </div>
<hr/> <div class="refsect2" lang="en"><h3><a name="CHECK_ARITY">Macro </a>CHECK_ARITY</h3><pre class="programlisting">#define <a href="#CHECK_ARITY">CHECK_ARITY</a>(x);
</pre><p>Macro to check that the number of args passed to an
XPath function matches.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>x
:</span></td><td>the
number of expected
args</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="CHECK_ERROR">Macro </a>CHECK_ERROR</h3><pre class="programlisting">#define <a href="#CHECK_ERROR">CHECK_ERROR</a>;
</pre><p>Macro to return from the function if an XPath error was detected.</p> </div>
<hr/> <div class="refsect2" lang="en"><h3><a name="CHECK_ERROR0">Macro </a>CHECK_ERROR0</h3><pre class="programlisting">#define <a href="#CHECK_ERROR0">CHECK_ERROR0</a>;
</pre><p>Macro to return 0 from the function if an XPath error was detected.</p> </div>
<hr/> <div class="refsect2" lang="en"><h3><a name="CHECK_TYPE">Macro </a>CHECK_TYPE</h3><pre class="programlisting">#define <a href="#CHECK_TYPE">CHECK_TYPE</a>(typeval);
</pre><p>Macro to check that the value on top of the XPath
stack is of a given type.</p><div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>typeval
:</span></td><td>the
XPath type</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="CHECK_TYPE0">Macro </a>CHECK_TYPE0</h3><pre class="programlisting">#define <a href="#CHECK_TYPE0">CHECK_TYPE0</a>(typeval);
</pre><p>Macro to check that the value on top of the XPath
stack is of a given type. Return(0) in case of failure</p><div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>typeval
:</span></td><td>the
XPath type</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="XP_ERROR">Macro </a>XP_ERROR</h3><pre class="programlisting">#define <a href="#XP_ERROR">XP_ERROR</a>(X);
</pre><p>Macro to raise an XPath error and
return.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>X
:</span></td><td>the
error code</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="XP_ERROR0">Macro </a>XP_ERROR0</h3><pre class="programlisting">#define <a href="#XP_ERROR0">XP_ERROR0</a>(X);
</pre><p>Macro to raise an XPath error and return
0.</p><div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>X
:</span></td><td>the
error code</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathCheckError">Macro </a>xmlXPathCheckError</h3><pre class="programlisting">#define <a href="#xmlXPathCheckError">xmlXPathCheckError</a>(ctxt);
</pre><p>Check if an XPath error was raised. Returns true if an
error has been raised, false otherwise.</p><div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathEmptyNodeSet">Macro </a>xmlXPathEmptyNodeSet</h3><pre class="programlisting">#define <a href="#xmlXPathEmptyNodeSet">xmlXPathEmptyNodeSet</a>(ns);
</pre><p>Empties a node-set.</p><div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ns
:</span></td><td>a
node-set</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathGetContextNode">Macro </a>xmlXPathGetContextNode</h3><pre class="programlisting">#define <a href="#xmlXPathGetContextNode">xmlXPathGetContextNode</a>(ctxt);
</pre><p>Get the context node of an XPath context. Returns the
context node.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathGetDocument">Macro </a>xmlXPathGetDocument</h3><pre class="programlisting">#define <a href="#xmlXPathGetDocument">xmlXPathGetDocument</a>(ctxt);
</pre><p>Get the document of an XPath context. Returns the
context document.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathGetError">Macro </a>xmlXPathGetError</h3><pre class="programlisting">#define <a href="#xmlXPathGetError">xmlXPathGetError</a>(ctxt);
</pre><p>Get the error code of an XPath context. Returns the
context error.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnBoolean">Macro </a>xmlXPathReturnBoolean</h3><pre class="programlisting">#define <a href="#xmlXPathReturnBoolean">xmlXPathReturnBoolean</a>(ctxt, val);
</pre><p>Pushes the boolean @val on the context
stack.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>val
:</span></td><td>a
boolean</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnEmptyNodeSet">Macro </a>xmlXPathReturnEmptyNodeSet</h3><pre class="programlisting">#define <a href="#xmlXPathReturnEmptyNodeSet">xmlXPathReturnEmptyNodeSet</a>(ctxt);
</pre><p>Pushes an empty node-set on the context
stack.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnEmptyString">Macro </a>xmlXPathReturnEmptyString</h3><pre class="programlisting">#define <a href="#xmlXPathReturnEmptyString">xmlXPathReturnEmptyString</a>(ctxt);
</pre><p>Pushes an empty string on the stack.</p><div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnExternal">Macro </a>xmlXPathReturnExternal</h3><pre class="programlisting">#define <a href="#xmlXPathReturnExternal">xmlXPathReturnExternal</a>(ctxt, val);
</pre><p>Pushes user data on the context
stack.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>val
:</span></td><td>user
data</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnFalse">Macro </a>xmlXPathReturnFalse</h3><pre class="programlisting">#define <a href="#xmlXPathReturnFalse">xmlXPathReturnFalse</a>(ctxt);
</pre><p>Pushes false on the context stack.</p><div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnNodeSet">Macro </a>xmlXPathReturnNodeSet</h3><pre class="programlisting">#define <a href="#xmlXPathReturnNodeSet">xmlXPathReturnNodeSet</a>(ctxt, ns);
</pre><p>Pushes the node-set @ns on the context
stack.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>ns
:</span></td><td>a
node-set</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnNumber">Macro </a>xmlXPathReturnNumber</h3><pre class="programlisting">#define <a href="#xmlXPathReturnNumber">xmlXPathReturnNumber</a>(ctxt, val);
</pre><p>Pushes the double @val on the context
stack.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>val
:</span></td><td>a
double</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnString">Macro </a>xmlXPathReturnString</h3><pre class="programlisting">#define <a href="#xmlXPathReturnString">xmlXPathReturnString</a>(ctxt, str);
</pre><p>Pushes the string @str on the context
stack.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>str
:</span></td><td>a
string</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnTrue">Macro </a>xmlXPathReturnTrue</h3><pre class="programlisting">#define <a href="#xmlXPathReturnTrue">xmlXPathReturnTrue</a>(ctxt);
</pre><p>Pushes true on the context stack.</p><div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathSetArityError">Macro </a>xmlXPathSetArityError</h3><pre class="programlisting">#define <a href="#xmlXPathSetArityError">xmlXPathSetArityError</a>(ctxt);
</pre><p>Raises an <a
href=“libxml2-xpath.html#XPATH_INVALID_ARITY”>XPATH_INVALID_ARITY</a>
error.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathSetError">Macro </a>xmlXPathSetError</h3><pre class="programlisting">#define <a href="#xmlXPathSetError">xmlXPathSetError</a>(ctxt, err);
</pre><p>Raises an error.</p><div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>err
:</span></td><td>an
<a href=“libxml2-xpath.html#xmlXPathError”>xmlXPathError</a>
code</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathSetTypeError">Macro </a>xmlXPathSetTypeError</h3><pre class="programlisting">#define <a href="#xmlXPathSetTypeError">xmlXPathSetTypeError</a>(ctxt);
</pre><p>Raises an <a
href=“libxml2-xpath.html#XPATH_INVALID_TYPE”>XPATH_INVALID_TYPE</a>
error.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathStackIsExternal">Macro </a>xmlXPathStackIsExternal</h3><pre class="programlisting">#define <a href="#xmlXPathStackIsExternal">xmlXPathStackIsExternal</a>(ctxt);
</pre><p>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.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathStackIsNodeSet">Macro </a>xmlXPathStackIsNodeSet</h3><pre class="programlisting">#define <a href="#xmlXPathStackIsNodeSet">xmlXPathStackIsNodeSet</a>(ctxt);
</pre><p>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.</p><div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser
context</td></tr></tbody></table></div>
</div>
<hr/> <div class="refsect2" lang="en"><h3><a name="valuePop"/>valuePop ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> valuePop (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Pops the top XPath object from the value
stack</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath evaluation context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
XPath object just
removed</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="valuePush"/>valuePush ()</h3><pre class="programlisting">int valuePush (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> value)<br/>
</pre><p>Pushes a new XPath object on top of the value stack.
If value is NULL, a memory error is recorded in the parser
context.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath evaluation context</td></tr><tr><td><span
class=“term”>value
:</span></td><td>the
XPath object</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
number of items on the value stack, or -1 in case of
error.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathAddValues"/>xmlXPathAddValues ()</h3><pre class="programlisting">void xmlXPathAddValues (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Implement the add operation on XPath objects: The
numeric operators convert their operands to numbers as if by calling the
number function.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathBooleanFunction"/>xmlXPathBooleanFunction ()</h3><pre class="programlisting">void xmlXPathBooleanFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathCeilingFunction"/>xmlXPathCeilingFunction ()</h3><pre class="programlisting">void xmlXPathCeilingFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathCompareValues"/>xmlXPathCompareValues ()</h3><pre class="programlisting">int xmlXPathCompareValues (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int inf, <br/> int strict)<br/>
</pre><p>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.</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>inf
:</span></td><td>less
than (1) or greater than
(0)</td></tr><tr><td><span
class=“term”>strict
:</span></td><td>is
the comparison strict</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>1
if the comparison succeeded, 0 if it
failed</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathConcatFunction"/>xmlXPathConcatFunction ()</h3><pre class="programlisting">void xmlXPathConcatFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>Implement the concat() XPath function string
concat(string, string, string*) The concat function returns the
concatenation of its arguments.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathContainsFunction"/>xmlXPathContainsFunction ()</h3><pre class="programlisting">void xmlXPathContainsFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathCountFunction"/>xmlXPathCountFunction ()</h3><pre class="programlisting">void xmlXPathCountFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>Implement the count() XPath function number
count(node-set)</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathDebugDumpCompExpr"/>xmlXPathDebugDumpCompExpr ()</h3><pre class="programlisting">void xmlXPathDebugDumpCompExpr (FILE * output, <br/> <a href="libxml2-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp, <br/> int depth)<br/>
</pre><p>Dumps the tree of the compiled XPath
expression.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>output
:</span></td><td>the
FILE * for the output</td></tr><tr><td><span
class=“term”>comp
:</span></td><td>the
precompiled XPath
expression</td></tr><tr><td><span
class=“term”>depth
:</span></td><td>the
indentation
level.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathDebugDumpObject"/>xmlXPathDebugDumpObject ()</h3><pre class="programlisting">void xmlXPathDebugDumpObject (FILE * output, <br/> <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> cur, <br/> int depth)<br/>
</pre><p>Dump the content of the object for debugging
purposes</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>output
:</span></td><td>the
FILE * to dump the output</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
object to inspect</td></tr><tr><td><span
class=“term”>depth
:</span></td><td>indentation
level</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathDifference"/>xmlXPathDifference ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathDifference (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes1, <br/> <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes2)<br/>
</pre><p>Implements the EXSLT - Sets difference() function:
node-set set:difference (node-set, node-set)</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes1
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>nodes2
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
difference between the two node sets, or nodes1 if nodes2 is
empty</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathDistinct"/>xmlXPathDistinct ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathDistinct (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes)<br/>
</pre><p>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</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>a
subset of the nodes contained in @nodes, or @nodes if it is
empty</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathDistinctSorted"/>xmlXPathDistinctSorted ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathDistinctSorted (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes)<br/>
</pre><p>Implements the EXSLT - Sets distinct() function:
node-set set:distinct (node-set)</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes
:</span></td><td>a
node-set, sorted by document
order</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>a
subset of the nodes contained in @nodes, or @nodes if it is
empty</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathDivValues"/>xmlXPathDivValues ()</h3><pre class="programlisting">void xmlXPathDivValues (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Implement the div operation on XPath objects @arg1 /
@arg2: The numeric operators convert their operands to numbers as if by
calling the number function.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathEqualValues"/>xmlXPathEqualValues ()</h3><pre class="programlisting">int xmlXPathEqualValues (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Implement the equal operation on XPath objects
content: @arg1 == @arg2</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
or 1 depending on the results of the
test.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathErr"/>xmlXPathErr ()</h3><pre class="programlisting">void xmlXPathErr (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int error)<br/>
</pre><p>Handle an XPath error</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>a
XPath parser context</td></tr><tr><td><span
class=“term”>error
:</span></td><td>the
error
code</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathEvalExpr"/>xmlXPathEvalExpr ()</h3><pre class="programlisting">void xmlXPathEvalExpr (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Parse and evaluate an XPath expression in the given
context, then push the result on the context stack</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathEvaluatePredicateResult"/>xmlXPathEvaluatePredicateResult ()</h3><pre class="programlisting">int xmlXPathEvaluatePredicateResult (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> res)<br/>
</pre><p>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.</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>res
:</span></td><td>the
Predicate Expression evaluation
result</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>1
if predicate is true, 0
otherwise</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathFalseFunction"/>xmlXPathFalseFunction ()</h3><pre class="programlisting">void xmlXPathFalseFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>Implement the false() XPath function boolean
false()</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathFloorFunction"/>xmlXPathFloorFunction ()</h3><pre class="programlisting">void xmlXPathFloorFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathFreeParserContext"/>xmlXPathFreeParserContext ()</h3><pre class="programlisting">void xmlXPathFreeParserContext (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Free up an <a
href=“libxml2-xpath.html#xmlXPathParserContext”>xmlXPathParserContext</a></p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
context to
free</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathFunctionLookup"/>xmlXPathFunctionLookup ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathFunction">xmlXPathFunction</a> xmlXPathFunctionLookup (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br/>
</pre><p>Search in the Function array of the context for the
given function.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>name
:</span></td><td>the
function name</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
<a
href=“libxml2-xpath.html#xmlXPathFunction”>xmlXPathFunction</a> or
NULL if not
found</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathFunctionLookupNS"/>xmlXPathFunctionLookupNS ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathFunction">xmlXPathFunction</a> xmlXPathFunctionLookupNS (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri)<br/>
</pre><p>Search in the Function array of the context for the
given function.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>name
:</span></td><td>the
function name</td></tr><tr><td><span
class=“term”>ns_uri
:</span></td><td>the
function namespace URI</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
<a
href=“libxml2-xpath.html#xmlXPathFunction”>xmlXPathFunction</a> or
NULL if not
found</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathHasSameNodes"/>xmlXPathHasSameNodes ()</h3><pre class="programlisting">int xmlXPathHasSameNodes (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes1, <br/> <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes2)<br/>
</pre><p>Implements the EXSLT - Sets has-same-nodes function:
boolean set:has-same-node(node-set, node-set)</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes1
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>nodes2
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>true
(1) if @nodes1 shares any node with @nodes2, false (0)
otherwise</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathIdFunction"/>xmlXPathIdFunction ()</h3><pre class="programlisting">void xmlXPathIdFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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 <a
href=“libxml2-SAX.html#characters”>characters</a> 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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathIntersection"/>xmlXPathIntersection ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathIntersection (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes1, <br/> <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes2)<br/>
</pre><p>Implements the EXSLT - Sets intersection() function:
node-set set:intersection (node-set, node-set)</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes1
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>nodes2
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>a
node set comprising the nodes that are within both the node sets passed as
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathIsNodeType"/>xmlXPathIsNodeType ()</h3><pre class="programlisting">int xmlXPathIsNodeType (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br/>
</pre><p>Is the name given a NodeType one. [38] NodeType ::=
'comment' | 'text' | 'processing-instruction' |
'node'</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>name
:</span></td><td>a
name string</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>1
if true 0
otherwise</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathLangFunction"/>xmlXPathLangFunction ()</h3><pre class="programlisting">void xmlXPathLangFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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 <a href=“libxml2-SAX.html#attribute”>attribute</a> on
the context node, or, if the context node has no xml:lang attribute, by the
value of the xml:lang <a
href=“libxml2-SAX.html#attribute”>attribute</a> on the nearest
ancestor of the context node that has an xml:lang attribute. If there is no
such attribute, then lang</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathLastFunction"/>xmlXPathLastFunction ()</h3><pre class="programlisting">void xmlXPathLastFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>Implement the last() XPath function number last() The
last function returns the number of nodes in the context node
list.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathLeading"/>xmlXPathLeading ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathLeading (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes1, <br/> <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes2)<br/>
</pre><p>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.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes1
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>nodes2
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>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</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathLeadingSorted"/>xmlXPathLeadingSorted ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathLeadingSorted (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes1, <br/> <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes2)<br/>
</pre><p>Implements the EXSLT - Sets leading() function:
node-set set:leading (node-set, node-set)</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes1
:</span></td><td>a
node-set, sorted by document
order</td></tr><tr><td><span
class=“term”>nodes2
:</span></td><td>a
node-set, sorted by document
order</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>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</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathLocalNameFunction"/>xmlXPathLocalNameFunction ()</h3><pre class="programlisting">void xmlXPathLocalNameFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathModValues"/>xmlXPathModValues ()</h3><pre class="programlisting">void xmlXPathModValues (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Implement the mod operation on XPath objects: @arg1 /
@arg2 The numeric operators convert their operands to numbers as if by
calling the number function.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathMultValues"/>xmlXPathMultValues ()</h3><pre class="programlisting">void xmlXPathMultValues (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Implement the multiply operation on XPath objects: The
numeric operators convert their operands to numbers as if by calling the
number function.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNamespaceURIFunction"/>xmlXPathNamespaceURIFunction ()</h3><pre class="programlisting">void xmlXPathNamespaceURIFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNewBoolean"/>xmlXPathNewBoolean ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathNewBoolean (int val)<br/>
</pre><p>Create a new <a
href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
of type boolean and of value @val</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
boolean value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNewCString"/>xmlXPathNewCString ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathNewCString (const char * val)<br/>
</pre><p>Create a new <a
href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
of type string and of value @val</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
char * value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNewFloat"/>xmlXPathNewFloat ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathNewFloat (double val)<br/>
</pre><p>Create a new <a
href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
of type double and of value @val</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
double value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNewNodeSet"/>xmlXPathNewNodeSet ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathNewNodeSet (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> val)<br/>
</pre><p>Create a new <a
href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
of type NodeSet and initialize it with the single Node @val</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
NodePtr value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNewNodeSetList"/>xmlXPathNewNodeSetList ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathNewNodeSetList (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> val)<br/>
</pre><p>Create a new <a
href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
of type NodeSet and initialize it with the Nodeset @val</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>an
existing NodeSet</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNewParserContext"/>xmlXPathNewParserContext ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> xmlXPathNewParserContext (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str, <br/> <a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt)<br/>
</pre><p>Create a new <a
href=“libxml2-xpath.html#xmlXPathParserContext”>xmlXPathParserContext</a></p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>str
:</span></td><td>the
XPath expression</td></tr><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
<a
href=“libxml2-xpath.html#xmlXPathParserContext”>xmlXPathParserContext</a>
just
allocated.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNewString"/>xmlXPathNewString ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathNewString (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * val)<br/>
</pre><p>Create a new <a
href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
of type string and of value @val</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
<a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> *
value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNewValueTree"/>xmlXPathNewValueTree ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathNewValueTree (<a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> val)<br/>
</pre><p>Create a new <a
href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
of type Value Tree (XSLT) and initialize it with the tree root
@val</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
NodePtr value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextAncestor"/>xmlXPathNextAncestor ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextAncestor (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>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</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextAncestorOrSelf"/>xmlXPathNextAncestorOrSelf ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextAncestorOrSelf (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>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.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextAttribute"/>xmlXPathNextAttribute ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextAttribute (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>Traversal function for the “attribute” direction TODO:
support DTD inherited default attributes</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current <a href=“libxml2-SAX.html#attribute”>attribute</a> in
the traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextChild"/>xmlXPathNextChild ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextChild (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>Traversal function for the “child” direction The child
axis contains the children of the context node in document order.</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextDescendant"/>xmlXPathNextDescendant ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextDescendant (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>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.</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextDescendantOrSelf"/>xmlXPathNextDescendantOrSelf ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextDescendantOrSelf (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>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</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextFollowing"/>xmlXPathNextFollowing ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextFollowing (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>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 <a
href=“libxml2-SAX.html#attribute”>attribute</a> nodes and
namespace nodes; the nodes are ordered in document order</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextFollowingSibling"/>xmlXPathNextFollowingSibling ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextFollowingSibling (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>Traversal function for the “following-sibling”
direction The following-sibling axis contains the following siblings of the
context node in document order.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextNamespace"/>xmlXPathNextNamespace ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextNamespace (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current <a href=“libxml2-SAX.html#attribute”>attribute</a> in
the traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextParent"/>xmlXPathNextParent ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextParent (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>Traversal function for the “parent” direction The
parent axis contains the parent of the context node, if there is
one.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextPreceding"/>xmlXPathNextPreceding ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextPreceding (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>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 <a
href=“libxml2-SAX.html#attribute”>attribute</a> nodes and
namespace nodes; the nodes are ordered in reverse document order</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextPrecedingSibling"/>xmlXPathNextPrecedingSibling ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextPrecedingSibling (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNextSelf"/>xmlXPathNextSelf ()</h3><pre class="programlisting"><a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> xmlXPathNextSelf (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> cur)<br/>
</pre><p>Traversal function for the “self” direction The self
axis contains just the context node itself</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
current node in the
traversal</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next element following that
axis</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeLeading"/>xmlXPathNodeLeading ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathNodeLeading (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node)<br/>
</pre><p>Implements the EXSLT - Sets leading() function:
node-set set:leading (node-set, node-set) @nodes is sorted by document
order, then exslSetsNodeLeadingSorted is called.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>node
:</span></td><td>a
node</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>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</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeLeadingSorted"/>xmlXPathNodeLeadingSorted ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathNodeLeadingSorted (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node)<br/>
</pre><p>Implements the EXSLT - Sets leading() function:
node-set set:leading (node-set, node-set)</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes
:</span></td><td>a
node-set, sorted by document
order</td></tr><tr><td><span
class=“term”>node
:</span></td><td>a
node</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>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</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeSetAdd"/>xmlXPathNodeSetAdd ()</h3><pre class="programlisting">int xmlXPathNodeSetAdd (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> cur, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> val)<br/>
</pre><p>add a new <a
href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> to an existing
NodeSet</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>cur
:</span></td><td>the
initial node set</td></tr><tr><td><span
class=“term”>val
:</span></td><td>a
new <a
href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a></td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
in case of success, and -1 in case of
error</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeSetAddNs"/>xmlXPathNodeSetAddNs ()</h3><pre class="programlisting">int xmlXPathNodeSetAddNs (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> cur, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br/> <a href="libxml2-tree.html#xmlNsPtr">xmlNsPtr</a> ns)<br/>
</pre><p>add a new namespace node to an existing
NodeSet</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>cur
:</span></td><td>the
initial node set</td></tr><tr><td><span
class=“term”>node
:</span></td><td>the
hosting node</td></tr><tr><td><span
class=“term”>ns
:</span></td><td>a
the namespace node</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
in case of success and -1 in case of
error</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeSetAddUnique"/>xmlXPathNodeSetAddUnique ()</h3><pre class="programlisting">int xmlXPathNodeSetAddUnique (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> cur, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> val)<br/>
</pre><p>add a new <a
href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> to an existing
NodeSet, optimized version when we are sure the node is not already in the
set.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>cur
:</span></td><td>the
initial node set</td></tr><tr><td><span
class=“term”>val
:</span></td><td>a
new <a
href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a></td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
in case of success and -1 in case of
failure</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeSetContains"/>xmlXPathNodeSetContains ()</h3><pre class="programlisting">int xmlXPathNodeSetContains (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> cur, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> val)<br/>
</pre><p>checks whether @cur contains @val</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>cur
:</span></td><td>the
node-set</td></tr><tr><td><span
class=“term”>val
:</span></td><td>the
node</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>true
(1) if @cur contains @val, false (0)
otherwise</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeSetDel"/>xmlXPathNodeSetDel ()</h3><pre class="programlisting">void xmlXPathNodeSetDel (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> cur, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> val)<br/>
</pre><p>Removes an <a
href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a> from an
existing NodeSet</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>cur
:</span></td><td>the
initial node set</td></tr><tr><td><span
class=“term”>val
:</span></td><td>an
<a
href=“libxml2-tree.html#xmlNodePtr”>xmlNodePtr</a></td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeSetFreeNs"/>xmlXPathNodeSetFreeNs ()</h3><pre class="programlisting">void xmlXPathNodeSetFreeNs (<a href="libxml2-tree.html#xmlNsPtr">xmlNsPtr</a> ns)<br/>
</pre><p>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</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ns
:</span></td><td>the
XPath namespace node found in a
nodeset.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeSetMerge"/>xmlXPathNodeSetMerge ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathNodeSetMerge (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> val1, <br/> <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> val2)<br/>
</pre><p>Merges two nodesets, all nodes from @val2 are added to
@val1 if @val1 is NULL, a new set is created and copied from
@val2</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val1
:</span></td><td>the
first NodeSet or NULL</td></tr><tr><td><span
class=“term”>val2
:</span></td><td>the
second NodeSet</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>@val1
once extended or NULL in case of
error.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeSetRemove"/>xmlXPathNodeSetRemove ()</h3><pre class="programlisting">void xmlXPathNodeSetRemove (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> cur, <br/> int val)<br/>
</pre><p>Removes an entry from an existing NodeSet
list.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>cur
:</span></td><td>the
initial node set</td></tr><tr><td><span
class=“term”>val
:</span></td><td>the
index to
remove</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeSetSort"/>xmlXPathNodeSetSort ()</h3><pre class="programlisting">void xmlXPathNodeSetSort (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> set)<br/>
</pre><p>Sort the node set in document order</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>set
:</span></td><td>the
node
set</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeTrailing"/>xmlXPathNodeTrailing ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathNodeTrailing (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node)<br/>
</pre><p>Implements the EXSLT - Sets trailing() function:
node-set set:trailing (node-set, node-set) @nodes is sorted by document
order, then xmlXPathNodeTrailingSorted is called.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>node
:</span></td><td>a
node</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>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</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNodeTrailingSorted"/>xmlXPathNodeTrailingSorted ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathNodeTrailingSorted (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br/> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node)<br/>
</pre><p>Implements the EXSLT - Sets trailing() function:
node-set set:trailing (node-set, node-set)</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes
:</span></td><td>a
node-set, sorted by document
order</td></tr><tr><td><span
class=“term”>node
:</span></td><td>a
node</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>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</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNormalizeFunction"/>xmlXPathNormalizeFunction ()</h3><pre class="programlisting">void xmlXPathNormalizeFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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 <a
href=“libxml2-SAX.html#characters”>characters</a> by a single
space. Whitespace <a
href=“libxml2-SAX.html#characters”>characters</a> 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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNotEqualValues"/>xmlXPathNotEqualValues ()</h3><pre class="programlisting">int xmlXPathNotEqualValues (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Implement the equal operation on XPath objects
content: @arg1 == @arg2</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
or 1 depending on the results of the
test.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNotFunction"/>xmlXPathNotFunction ()</h3><pre class="programlisting">void xmlXPathNotFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>Implement the not() XPath function boolean
not(boolean) The not function returns true if its argument is false, and
false otherwise.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNsLookup"/>xmlXPathNsLookup ()</h3><pre class="programlisting">const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlXPathNsLookup (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix)<br/>
</pre><p>Search in the namespace declaration array of the
context for the given namespace name associated to the given
prefix</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>prefix
:</span></td><td>the
namespace prefix value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
value or NULL if not
found</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathNumberFunction"/>xmlXPathNumberFunction ()</h3><pre class="programlisting">void xmlXPathNumberFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>Implement the number() XPath function number
number(object?)</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathParseNCName"/>xmlXPathParseNCName ()</h3><pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlXPathParseNCName (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>parse an XML namespace non qualified name. [NS 3]
NCName ::= (Letter | '_') (NCNameChar)* [NS 4] NCNameChar ::=
Letter | Digit | '.' | '-' | '_' | CombiningChar |
Extender</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
namespace name or
NULL</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathParseName"/>xmlXPathParseName ()</h3><pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlXPathParseName (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>parse an XML name [4] NameChar ::= Letter | Digit |
'.' | '-' | '_' | ':' | CombiningChar |
Extender [5] Name ::= (Letter | '_' | ':')
(NameChar)*</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
namespace name or
NULL</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathPopBoolean"/>xmlXPathPopBoolean ()</h3><pre class="programlisting">int xmlXPathPopBoolean (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Pops a boolean from the stack, handling conversion if
needed. Check error with xmlXPathCheckError.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
boolean</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathPopExternal"/>xmlXPathPopExternal ()</h3><pre class="programlisting">void * xmlXPathPopExternal (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Pops an external object from the stack, handling
conversion if needed. Check error with xmlXPathCheckError.</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
object</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathPopNodeSet"/>xmlXPathPopNodeSet ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathPopNodeSet (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Pops a node-set from the stack, handling conversion if
needed. Check error with xmlXPathCheckError.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
node-set</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathPopNumber"/>xmlXPathPopNumber ()</h3><pre class="programlisting">double xmlXPathPopNumber (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Pops a number from the stack, handling conversion if
needed. Check error with xmlXPathCheckError.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
number</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathPopString"/>xmlXPathPopString ()</h3><pre class="programlisting"><a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlXPathPopString (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Pops a string from the stack, handling conversion if
needed. Check error with xmlXPathCheckError.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath parser context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
string</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathPositionFunction"/>xmlXPathPositionFunction ()</h3><pre class="programlisting">void xmlXPathPositionFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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().</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisterAllFunctions"/>xmlXPathRegisterAllFunctions ()</h3><pre class="programlisting">void xmlXPathRegisterAllFunctions (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt)<br/>
</pre><p>Registers all default XPath functions in this
context</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisterFunc"/>xmlXPathRegisterFunc ()</h3><pre class="programlisting">int xmlXPathRegisterFunc (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/> <a href="libxml2-xpath.html#xmlXPathFunction">xmlXPathFunction</a> f)<br/>
</pre><p>Register a new function. If @f is NULL it unregisters
the function</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>name
:</span></td><td>the
function name</td></tr><tr><td><span
class=“term”>f
:</span></td><td>the
function implementation or
NULL</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
in case of success, -1 in case of
error</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisterFuncLookup"/>xmlXPathRegisterFuncLookup ()</h3><pre class="programlisting">void xmlXPathRegisterFuncLookup (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> <a href="libxml2-xpath.html#xmlXPathFuncLookupFunc">xmlXPathFuncLookupFunc</a> f, <br/> void * funcCtxt)<br/>
</pre><p>Registers an external mechanism to do function
lookup.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>f
:</span></td><td>the
lookup function</td></tr><tr><td><span
class=“term”>funcCtxt
:</span></td><td>the
lookup
data</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisterFuncNS"/>xmlXPathRegisterFuncNS ()</h3><pre class="programlisting">int xmlXPathRegisterFuncNS (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri, <br/> <a href="libxml2-xpath.html#xmlXPathFunction">xmlXPathFunction</a> f)<br/>
</pre><p>Register a new function. If @f is NULL it unregisters
the function</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>name
:</span></td><td>the
function name</td></tr><tr><td><span
class=“term”>ns_uri
:</span></td><td>the
function namespace URI</td></tr><tr><td><span
class=“term”>f
:</span></td><td>the
function implementation or
NULL</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
in case of success, -1 in case of
error</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisterNs"/>xmlXPathRegisterNs ()</h3><pre class="programlisting">int xmlXPathRegisterNs (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri)<br/>
</pre><p>Register a new namespace. If @ns_uri is NULL it
unregisters the namespace</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>prefix
:</span></td><td>the
namespace prefix cannot be NULL or empty
string</td></tr><tr><td><span
class=“term”>ns_uri
:</span></td><td>the
namespace name</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
in case of success, -1 in case of
error</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisterVariable"/>xmlXPathRegisterVariable ()</h3><pre class="programlisting">int xmlXPathRegisterVariable (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/> <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> value)<br/>
</pre><p>Register a new variable value. If @value is NULL it
unregisters the variable</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>name
:</span></td><td>the
variable name</td></tr><tr><td><span
class=“term”>value
:</span></td><td>the
variable value or NULL</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
in case of success, -1 in case of
error</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisterVariableLookup"/>xmlXPathRegisterVariableLookup ()</h3><pre class="programlisting">void xmlXPathRegisterVariableLookup (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> <a href="libxml2-xpath.html#xmlXPathVariableLookupFunc">xmlXPathVariableLookupFunc</a> f, <br/> void * data)<br/>
</pre><p>register an external mechanism to do variable
lookup</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>f
:</span></td><td>the
lookup function</td></tr><tr><td><span
class=“term”>data
:</span></td><td>the
lookup
data</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisterVariableNS"/>xmlXPathRegisterVariableNS ()</h3><pre class="programlisting">int xmlXPathRegisterVariableNS (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri, <br/> <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> value)<br/>
</pre><p>Register a new variable value. If @value is NULL it
unregisters the variable</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>name
:</span></td><td>the
variable name</td></tr><tr><td><span
class=“term”>ns_uri
:</span></td><td>the
variable namespace URI</td></tr><tr><td><span
class=“term”>value
:</span></td><td>the
variable value or NULL</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
in case of success, -1 in case of
error</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisteredFuncsCleanup"/>xmlXPathRegisteredFuncsCleanup ()</h3><pre class="programlisting">void xmlXPathRegisteredFuncsCleanup (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt)<br/>
</pre><p>Cleanup the XPath context data associated to
registered functions</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisteredNsCleanup"/>xmlXPathRegisteredNsCleanup ()</h3><pre class="programlisting">void xmlXPathRegisteredNsCleanup (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt)<br/>
</pre><p>Cleanup the XPath context data associated to
registered variables</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRegisteredVariablesCleanup"/>xmlXPathRegisteredVariablesCleanup ()</h3><pre class="programlisting">void xmlXPathRegisteredVariablesCleanup (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt)<br/>
</pre><p>Cleanup the XPath context data associated to
registered variables</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRoot"/>xmlXPathRoot ()</h3><pre class="programlisting">void xmlXPathRoot (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Initialize the context to the root of the
document</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathRoundFunction"/>xmlXPathRoundFunction ()</h3><pre class="programlisting">void xmlXPathRoundFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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 closest to positive infinity is returned.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathStartsWithFunction"/>xmlXPathStartsWithFunction ()</h3><pre class="programlisting">void xmlXPathStartsWithFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathStringEvalNumber"/>xmlXPathStringEvalNumber ()</h3><pre class="programlisting">double xmlXPathStringEvalNumber (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str)<br/>
</pre> 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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>str
:</span></td><td>A
string to scan</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
double
value.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathStringFunction"/>xmlXPathStringFunction ()</h3><pre class="programlisting">void xmlXPathStringFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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.</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathStringLengthFunction"/>xmlXPathStringLengthFunction ()</h3><pre class="programlisting">void xmlXPathStringLengthFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>Implement the string-length() XPath function number
string-length(string?) The string-length returns the number of <a
href=“libxml2-SAX.html#characters”>characters</a> 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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathSubValues"/>xmlXPathSubValues ()</h3><pre class="programlisting">void xmlXPathSubValues (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Implement the subtraction operation on XPath objects:
The numeric operators convert their operands to numbers as if by calling
the number function.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathSubstringAfterFunction"/>xmlXPathSubstringAfterFunction ()</h3><pre class="programlisting">void xmlXPathSubstringAfterFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathSubstringBeforeFunction"/>xmlXPathSubstringBeforeFunction ()</h3><pre class="programlisting">void xmlXPathSubstringBeforeFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathSubstringFunction"/>xmlXPathSubstringFunction ()</h3><pre class="programlisting">void xmlXPathSubstringFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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 <a
href=“libxml2-SAX.html#characters”>characters</a> 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 “”</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathSumFunction"/>xmlXPathSumFunction ()</h3><pre class="programlisting">void xmlXPathSumFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>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.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathTrailing"/>xmlXPathTrailing ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathTrailing (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes1, <br/> <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes2)<br/>
</pre><p>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.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes1
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>nodes2
:</span></td><td>a
node-set</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>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</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathTrailingSorted"/>xmlXPathTrailingSorted ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathTrailingSorted (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes1, <br/> <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes2)<br/>
</pre><p>Implements the EXSLT - Sets trailing() function:
node-set set:trailing (node-set, node-set)</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>nodes1
:</span></td><td>a
node-set, sorted by document
order</td></tr><tr><td><span
class=“term”>nodes2
:</span></td><td>a
node-set, sorted by document
order</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>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</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathTranslateFunction"/>xmlXPathTranslateFunction ()</h3><pre class="programlisting">void xmlXPathTranslateFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>Implement the translate() XPath function string
translate(string, string, string) The translate function returns the first
argument string with occurrences of <a
href=“libxml2-SAX.html#characters”>characters</a> 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”)</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathTrueFunction"/>xmlXPathTrueFunction ()</h3><pre class="programlisting">void xmlXPathTrueFunction (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> int nargs)<br/>
</pre><p>Implement the true() XPath function boolean
true()</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathValueFlipSign"/>xmlXPathValueFlipSign ()</h3><pre class="programlisting">void xmlXPathValueFlipSign (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Implement the unary - operation on an XPath object The
numeric operators convert their operands to numbers as if by calling the
number function.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser
context</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathVariableLookup"/>xmlXPathVariableLookup ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathVariableLookup (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br/>
</pre><p>Search in the Variable array of the context for the
given variable value.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>name
:</span></td><td>the
variable name</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>a
copy of the value or NULL if not
found</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathVariableLookupNS"/>xmlXPathVariableLookupNS ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathVariableLookupNS (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri)<br/>
</pre><p>Search in the Variable array of the context for the
given variable value.</p> <div class=“variablelist”><table
border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>name
:</span></td><td>the
variable name</td></tr><tr><td><span
class=“term”>ns_uri
:</span></td><td>the
variable namespace URI</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
a copy of the value or NULL if not
found</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathWrapCString"/>xmlXPathWrapCString ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathWrapCString (char * val)<br/>
</pre><p>Wraps a string into an XPath object.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
char * value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathWrapExternal"/>xmlXPathWrapExternal ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathWrapExternal (void * val)<br/>
</pre><p>Wraps the @val data into an XPath object.</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
user data</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathWrapNodeSet"/>xmlXPathWrapNodeSet ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathWrapNodeSet (<a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> val)<br/>
</pre><p>Wrap the Nodeset @val in a new <a
href=“libxml2-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a></p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
NodePtr value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPathWrapString"/>xmlXPathWrapString ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathWrapString (<a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * val)<br/>
</pre><p>Wraps the @val string into an XPath object.</p>
<div class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
<a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> *
value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div></div>
<hr/> <div class="refsect2" lang="en"><h3><a name="xmlXPatherror"/>xmlXPatherror ()</h3><pre class="programlisting">void xmlXPatherror (<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/> const char * file, <br/> int line, <br/> int no)<br/>
</pre><p>Formats an error message.</p> <div
class=“variablelist”><table border=“0”><col
align=“left”/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath Parser context</td></tr><tr><td><span
class=“term”>file
:</span></td><td>the
file name</td></tr><tr><td><span
class=“term”>line
:</span></td><td>the
line number</td></tr><tr><td><span
class=“term”>no
:</span></td><td>the
error
number</td></tr></tbody></table></div></div>
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