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div.deprecated pre.programlisting {border-style: double;border-color:red} pre.programlisting {border-style: double;background: #EECFA1} </style><title>Module xpath from libxml2</title></head><body bgcolor="#8b7765" text="#000000" link="#a06060" vlink="#000000"><table border="0" width="100%" cellpadding="5" cellspacing="0" align="center"><tr><td width="120"><a href="http://swpat.ffii.org/"><img src="../epatents.png" alt="Action against software patents" /></a></td><td width="180"><a href="http://www.gnome.org/"><img src="../gnome2.png" alt="Gnome2 Logo" /></a><a href="http://www.w3.org/Status"><img src="../w3c.png" alt="W3C Logo" /></a><a href="http://www.redhat.com/"><img src="../redhat.gif" alt="Red Hat Logo" /></a><div align="left"><a href="http://xmlsoft.org/"><img src="../Libxml2-Logo-180x168.gif" alt="Made with Libxml2 Logo" /></a></div></td><td><table border="0" width="90%" cellpadding="2" cellspacing="0" align="center" bgcolor="#000000"><tr><td><table width="100%" border="0" 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height="24" border="0" alt="Up" /></a></td><th align="left"><a href="index.html">API documentation</a></th><td><a accesskey="h" href="../index.html"><img src="home.png" width="24" height="24" border="0" alt="Home" /></a></td><th align="center"><a href="../index.html">The XML C parser and toolkit of Gnome</a></th><th align="right"><a href="libxml-xpathInternals.html">xpathInternals</a></th><td><a accesskey="n" href="libxml-xpathInternals.html"><img src="right.png" width="24" height="24" border="0" alt="Next" /></a></td></tr></table><p>API for the XML Path Language implementation XML Path Language implementation XPath is a language for addressing parts of an XML document, designed to be used by both XSLT and XPointer</p><h2>Table of Contents</h2><pre class="programlisting">#define <a href="#XML_XPATH_CHECKNS">XML_XPATH_CHECKNS</a></pre><pre class="programlisting">#define <a href="#XML_XPATH_NOVAR">XML_XPATH_NOVAR</a></pre><pre class="programlisting">#define <a href="#xmlXPathNodeSetGetLength">xmlXPathNodeSetGetLength</a></pre><pre class="programlisting">#define <a href="#xmlXPathNodeSetIsEmpty">xmlXPathNodeSetIsEmpty</a></pre><pre class="programlisting">#define <a href="#xmlXPathNodeSetItem">xmlXPathNodeSetItem</a></pre><pre class="programlisting">Structure <a href="#xmlNodeSet">xmlNodeSet</a><br />struct _xmlNodeSet
</pre><pre class=“programlisting”>Typedef <a href=“libxml-xpath.html#xmlNodeSet”>xmlNodeSet</a> * <a name=“xmlNodeSetPtr” id=“xmlNodeSetPtr”>xmlNodeSetPtr</a> </pre><pre class=“programlisting”>Structure <a href=“#xmlXPathAxis”>xmlXPathAxis</a><br />struct _xmlXPathAxis </pre><pre class=“programlisting”>Typedef <a href=“libxml-xpath.html#xmlXPathAxis”>xmlXPathAxis</a> * <a name=“xmlXPathAxisPtr” id=“xmlXPathAxisPtr”>xmlXPathAxisPtr</a> </pre><pre class=“programlisting”>Structure <a href=“#xmlXPathCompExpr”>xmlXPathCompExpr</a><br />struct _xmlXPathCompExpr The content of this structure is not made public by the API. </pre><pre class=“programlisting”>Typedef <a href=“libxml-xpath.html#xmlXPathCompExpr”>xmlXPathCompExpr</a> * <a name=“xmlXPathCompExprPtr” id=“xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a> </pre><pre class=“programlisting”>Structure <a href=“#xmlXPathContext”>xmlXPathContext</a><br />struct _xmlXPathContext </pre><pre class=“programlisting”>Typedef <a href=“libxml-xpath.html#xmlXPathContext”>xmlXPathContext</a> * <a name=“xmlXPathContextPtr” id=“xmlXPathContextPtr”>xmlXPathContextPtr</a> </pre><pre class=“programlisting”>Enum <a href=“#xmlXPathError”>xmlXPathError</a> </pre><pre class=“programlisting”>Typedef <a href=“libxml-xpath.html#xmlXPathFunct”>xmlXPathFunct</a> * <a name=“xmlXPathFuncPtr” id=“xmlXPathFuncPtr”>xmlXPathFuncPtr</a> </pre><pre class=“programlisting”>Structure <a href=“#xmlXPathFunct”>xmlXPathFunct</a><br />struct _xmlXPathFunct </pre><pre class=“programlisting”>Structure <a href=“#xmlXPathObject”>xmlXPathObject</a><br />struct _xmlXPathObject </pre><pre class=“programlisting”>Typedef <a href=“libxml-xpath.html#xmlXPathObject”>xmlXPathObject</a> * <a name=“xmlXPathObjectPtr” id=“xmlXPathObjectPtr”>xmlXPathObjectPtr</a> </pre><pre class=“programlisting”>Enum <a href=“#xmlXPathObjectType”>xmlXPathObjectType</a> </pre><pre class=“programlisting”>Structure <a href=“#xmlXPathParserContext”>xmlXPathParserContext</a><br />struct _xmlXPathParserContext </pre><pre class=“programlisting”>Typedef <a href=“libxml-xpath.html#xmlXPathParserContext”>xmlXPathParserContext</a> * <a name=“xmlXPathParserContextPtr” id=“xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> </pre><pre class=“programlisting”>Structure <a href=“#xmlXPathType”>xmlXPathType</a><br />struct _xmlXPathType </pre><pre class=“programlisting”>Typedef <a href=“libxml-xpath.html#xmlXPathType”>xmlXPathType</a> * <a name=“xmlXPathTypePtr” id=“xmlXPathTypePtr”>xmlXPathTypePtr</a> </pre><pre class=“programlisting”>Structure <a href=“#xmlXPathVariable”>xmlXPathVariable</a><br />struct _xmlXPathVariable </pre><pre class=“programlisting”>Typedef <a href=“libxml-xpath.html#xmlXPathVariable”>xmlXPathVariable</a> * <a name=“xmlXPathVariablePtr” id=“xmlXPathVariablePtr”>xmlXPathVariablePtr</a> </pre><pre class=“programlisting”>Function type: <a href=“#xmlXPathAxisFunc”>xmlXPathAxisFunc</a> <a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathAxisFunc”>xmlXPathAxisFunc</a> (<a href=“libxml-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br /> <a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> cur) </pre> <pre class=“programlisting”>double <a href=“#xmlXPathCastBooleanToNumber”>xmlXPathCastBooleanToNumber</a> (int val)</pre> <pre class=“programlisting”><a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * <a href=“#xmlXPathCastBooleanToString”>xmlXPathCastBooleanToString</a> (int val)</pre> <pre class=“programlisting”>int <a href=“#xmlXPathCastNodeSetToBoolean”>xmlXPathCastNodeSetToBoolean</a> (<a href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> ns)</pre> <pre class=“programlisting”>double <a href=“#xmlXPathCastNodeSetToNumber”>xmlXPathCastNodeSetToNumber</a> (<a href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> ns)</pre> <pre class=“programlisting”><a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * <a href=“#xmlXPathCastNodeSetToString”>xmlXPathCastNodeSetToString</a> (<a href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> ns)</pre> <pre class=“programlisting”>double <a href=“#xmlXPathCastNodeToNumber”>xmlXPathCastNodeToNumber</a> (<a href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node)</pre> <pre class=“programlisting”><a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * <a href=“#xmlXPathCastNodeToString”>xmlXPathCastNodeToString</a> (<a href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node)</pre> <pre class=“programlisting”>int <a href=“#xmlXPathCastNumberToBoolean”>xmlXPathCastNumberToBoolean</a> (double val)</pre> <pre class=“programlisting”><a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * <a href=“#xmlXPathCastNumberToString”>xmlXPathCastNumberToString</a> (double val)</pre> <pre class=“programlisting”>int <a href=“#xmlXPathCastStringToBoolean”>xmlXPathCastStringToBoolean</a> (const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * val)</pre> <pre class=“programlisting”>double <a href=“#xmlXPathCastStringToNumber”>xmlXPathCastStringToNumber</a> (const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * val)</pre> <pre class=“programlisting”>int <a href=“#xmlXPathCastToBoolean”>xmlXPathCastToBoolean</a> (<a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> val)</pre> <pre class=“programlisting”>double <a href=“#xmlXPathCastToNumber”>xmlXPathCastToNumber</a> (<a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> val)</pre> <pre class=“programlisting”><a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * <a href=“#xmlXPathCastToString”>xmlXPathCastToString</a> (<a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> val)</pre> <pre class=“programlisting”>int <a href=“#xmlXPathCmpNodes”>xmlXPathCmpNodes</a> (<a href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node1, <br /> <a href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node2)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a> <a href=“#xmlXPathCompile”>xmlXPathCompile</a> (const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * str)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathCompiledEval”>xmlXPathCompiledEval</a> (<a href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a> comp, <br /> <a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctx)</pre> <pre class=“programlisting”>int <a href=“#xmlXPathCompiledEvalToBoolean”>xmlXPathCompiledEvalToBoolean</a> (<a href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a> comp, <br /> <a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt)</pre> <pre class=“programlisting”>int <a href=“#xmlXPathContextSetCache”>xmlXPathContextSetCache</a> (<a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br /> int active, <br /> int value, <br /> int options)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathConvertBoolean”>xmlXPathConvertBoolean</a> (<a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> val)</pre> <pre class=“programlisting”>Function type: <a href=“#xmlXPathConvertFunc”>xmlXPathConvertFunc</a> int <a href=“#xmlXPathConvertFunc”>xmlXPathConvertFunc</a> (<a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> obj, <br /> int type) </pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathConvertNumber”>xmlXPathConvertNumber</a> (<a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> val)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathConvertString”>xmlXPathConvertString</a> (<a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> val)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a> <a href=“#xmlXPathCtxtCompile”>xmlXPathCtxtCompile</a> (<a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br /> const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * str)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathEval”>xmlXPathEval</a> (const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * str, <br /> <a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctx)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathEvalExpression”>xmlXPathEvalExpression</a> (const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * str, <br /> <a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt)</pre> <pre class=“programlisting”>Function type: <a href=“#xmlXPathEvalFunc”>xmlXPathEvalFunc</a> void <a href=“#xmlXPathEvalFunc”>xmlXPathEvalFunc</a> (<a href=“libxml-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br /> int nargs) </pre> <pre class=“programlisting”>int <a href=“#xmlXPathEvalPredicate”>xmlXPathEvalPredicate</a> (<a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt, <br /> <a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> res)</pre> <pre class=“programlisting”>void <a href=“#xmlXPathFreeCompExpr”>xmlXPathFreeCompExpr</a> (<a href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a> comp)</pre> <pre class=“programlisting”>void <a href=“#xmlXPathFreeContext”>xmlXPathFreeContext</a> (<a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctxt)</pre> <pre class=“programlisting”>void <a href=“#xmlXPathFreeNodeSet”>xmlXPathFreeNodeSet</a> (<a href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> obj)</pre> <pre class=“programlisting”>void <a href=“#xmlXPathFreeNodeSetList”>xmlXPathFreeNodeSetList</a> (<a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> obj)</pre> <pre class=“programlisting”>void <a href=“#xmlXPathFreeObject”>xmlXPathFreeObject</a> (<a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> obj)</pre> <pre class=“programlisting”>Function type: <a href=“#xmlXPathFuncLookupFunc”>xmlXPathFuncLookupFunc</a> <a href=“libxml-xpath.html#xmlXPathFunction”>xmlXPathFunction</a> <a href=“#xmlXPathFuncLookupFunc”>xmlXPathFuncLookupFunc</a> (void * ctxt, <br /> const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * name, <br /> const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * ns_uri) </pre> <pre class=“programlisting”>Function type: <a href=“#xmlXPathFunction”>xmlXPathFunction</a> void <a href=“#xmlXPathFunction”>xmlXPathFunction</a> (<a href=“libxml-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a> ctxt, <br /> int nargs) </pre> <pre class=“programlisting”>void <a href=“#xmlXPathInit”>xmlXPathInit</a> (void)</pre> <pre class=“programlisting”>int <a href=“#xmlXPathIsInf”>xmlXPathIsInf</a> (double val)</pre> <pre class=“programlisting”>int <a href=“#xmlXPathIsNaN”>xmlXPathIsNaN</a> (double val)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> <a href=“#xmlXPathNewContext”>xmlXPathNewContext</a> (<a href=“libxml-tree.html#xmlDocPtr”>xmlDocPtr</a> doc)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathNodeEval”>xmlXPathNodeEval</a> (<a href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node, <br /> const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * str, <br /> <a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctx)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> <a href=“#xmlXPathNodeSetCreate”>xmlXPathNodeSetCreate</a> (<a href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> val)</pre> <pre class=“programlisting”><a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathObjectCopy”>xmlXPathObjectCopy</a> (<a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> val)</pre> <pre class=“programlisting”>long <a href=“#xmlXPathOrderDocElems”>xmlXPathOrderDocElems</a> (<a href=“libxml-tree.html#xmlDocPtr”>xmlDocPtr</a> doc)</pre> <pre class=“programlisting”>int <a href=“#xmlXPathSetContextNode”>xmlXPathSetContextNode</a> (<a href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node, <br /> <a href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a> ctx)</pre> <pre class=“programlisting”>Function type: <a href=“#xmlXPathVariableLookupFunc”>xmlXPathVariableLookupFunc</a> <a href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a> <a href=“#xmlXPathVariableLookupFunc”>xmlXPathVariableLookupFunc</a> (void * ctxt, <br /> const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * name, <br /> const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * ns_uri) </pre> <h2>Description</h2> <h3><a name=“XML_XPATH_CHECKNS” id=“XML_XPATH_CHECKNS”></a>Macro: XML_XPATH_CHECKNS</h3><pre>#define XML_XPATH_CHECKNS</pre><p>check namespaces at compilation</p> <h3><a name=“XML_XPATH_NOVAR” id=“XML_XPATH_NOVAR”></a>Macro: XML_XPATH_NOVAR</h3><pre>#define XML_XPATH_NOVAR</pre><p>forbid variables in expression</p> <h3><a name=“xmlXPathNodeSetGetLength” id=“xmlXPathNodeSetGetLength”></a>Macro: xmlXPathNodeSetGetLength</h3><pre>#define xmlXPathNodeSetGetLength</pre><p>Implement a functionality similar to the DOM NodeList.length. Returns the number of nodes in the node-set.</p> <h3><a name=“xmlXPathNodeSetIsEmpty” id=“xmlXPathNodeSetIsEmpty”></a>Macro: xmlXPathNodeSetIsEmpty</h3><pre>#define xmlXPathNodeSetIsEmpty</pre><p>Checks whether @ns is empty or not. Returns %TRUE if @ns is an empty node-set.</p> <h3><a name=“xmlXPathNodeSetItem” id=“xmlXPathNodeSetItem”></a>Macro: xmlXPathNodeSetItem</h3><pre>#define xmlXPathNodeSetItem</pre><p>Implements a functionality similar to the DOM NodeList.item(). Returns the <a href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> at the given @index in @ns or NULL if @index is out of range (0 to length-1)</p> <h3><a name=“xmlNodeSet” id=“xmlNodeSet”>Structure xmlNodeSet</a></h3><pre class=“programlisting”>Structure xmlNodeSet<br />struct _xmlNodeSet {
int nodeNr : number of nodes in the set int nodeMax : size of the array as allocated <a href="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> * nodeTab : array of nodes in no particular order @
}</pre><h3><a name=“xmlXPathAxis” id=“xmlXPathAxis”>Structure xmlXPathAxis</a></h3><pre class=“programlisting”>Structure xmlXPathAxis<br />struct _xmlXPathAxis {
const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> * name : the axis name <a href="libxml-xpath.html#xmlXPathAxisFunc">xmlXPathAxisFunc</a> func : the search function
}</pre><h3><a name=“xmlXPathCompExpr” id=“xmlXPathCompExpr”>Structure xmlXPathCompExpr</a></h3><pre class=“programlisting”>Structure xmlXPathCompExpr<br />struct _xmlXPathCompExpr { The content of this structure is not made public by the API. }</pre><h3><a name=“xmlXPathContext” id=“xmlXPathContext”>Structure xmlXPathContext</a></h3><pre class=“programlisting”>Structure xmlXPathContext<br />struct _xmlXPathContext {
<a href="libxml-tree.html#xmlDocPtr">xmlDocPtr</a> doc : The current document <a href="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> node : The current node int nb_variables_unused : unused (hash table) int max_variables_unused : unused (hash table) <a href="libxml-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> varHash : Hash table of defined variables int nb_types : number of defined types int max_types : max number of types <a href="libxml-xpath.html#xmlXPathTypePtr">xmlXPathTypePtr</a> types : Array of defined types int nb_funcs_unused : unused (hash table) int max_funcs_unused : unused (hash table) <a href="libxml-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> funcHash : Hash table of defined funcs int nb_axis : number of defined axis int max_axis : max number of axis <a href="libxml-xpath.html#xmlXPathAxisPtr">xmlXPathAxisPtr</a> axis : Array of defined axis the namespace nod <a href="libxml-tree.html#xmlNsPtr">xmlNsPtr</a> * namespaces : Array of namespaces int nsNr : number of namespace in scope void * user : function to free extra variables int contextSize : the context size int proximityPosition : the proximity position extra stuff for int xptr : is this an XPointer context? <a href="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> here : for here() <a href="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> origin : for origin() the set of namespace decla <a href="libxml-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> nsHash : The namespaces hash table <a href="libxml-xpath.html#xmlXPathVariableLookupFunc">xmlXPathVariableLookupFunc</a> varLookupFunc : variable lookup func void * varLookupData : variable lookup data Possibility to lin void * extra : needed for XSLT The function name and U const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> * function const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> * functionURI : function lookup function and data <a href="libxml-xpath.html#xmlXPathFuncLookupFunc">xmlXPathFuncLookupFunc</a> funcLookupFunc : function lookup func void * funcLookupData : function lookup data temporary namespac <a href="libxml-tree.html#xmlNsPtr">xmlNsPtr</a> * tmpNsList : Array of namespaces int tmpNsNr : number of namespaces in scope error rep void * userData : user specific data block <a href="libxml-xmlerror.html#xmlStructuredErrorFunc">xmlStructuredErrorFunc</a> error : the callback in case of errors <a href="libxml-xmlerror.html#xmlError">xmlError</a> lastError : the last error <a href="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> debugNode : the source node XSLT dictionary <a href="libxml-dict.html#xmlDictPtr">xmlDictPtr</a> dict : dictionary if any int flags : flags to control compilation Cache for void * cache : Resource limits unsigned long opLimit unsigned long opCount int depth int maxDepth int maxParserDepth
}</pre><h3>Enum <a name=“xmlXPathError” id=“xmlXPathError”>xmlXPathError</a></h3><pre class=“programlisting”>Enum xmlXPathError {
<a name="XPATH_EXPRESSION_OK" id="XPATH_EXPRESSION_OK">XPATH_EXPRESSION_OK</a> = 0 <a name="XPATH_NUMBER_ERROR" id="XPATH_NUMBER_ERROR">XPATH_NUMBER_ERROR</a> = 1 <a name="XPATH_UNFINISHED_LITERAL_ERROR" id="XPATH_UNFINISHED_LITERAL_ERROR">XPATH_UNFINISHED_LITERAL_ERROR</a> = 2 <a name="XPATH_START_LITERAL_ERROR" id="XPATH_START_LITERAL_ERROR">XPATH_START_LITERAL_ERROR</a> = 3 <a name="XPATH_VARIABLE_REF_ERROR" id="XPATH_VARIABLE_REF_ERROR">XPATH_VARIABLE_REF_ERROR</a> = 4 <a name="XPATH_UNDEF_VARIABLE_ERROR" id="XPATH_UNDEF_VARIABLE_ERROR">XPATH_UNDEF_VARIABLE_ERROR</a> = 5 <a name="XPATH_INVALID_PREDICATE_ERROR" id="XPATH_INVALID_PREDICATE_ERROR">XPATH_INVALID_PREDICATE_ERROR</a> = 6 <a name="XPATH_EXPR_ERROR" id="XPATH_EXPR_ERROR">XPATH_EXPR_ERROR</a> = 7 <a name="XPATH_UNCLOSED_ERROR" id="XPATH_UNCLOSED_ERROR">XPATH_UNCLOSED_ERROR</a> = 8 <a name="XPATH_UNKNOWN_FUNC_ERROR" id="XPATH_UNKNOWN_FUNC_ERROR">XPATH_UNKNOWN_FUNC_ERROR</a> = 9 <a name="XPATH_INVALID_OPERAND" id="XPATH_INVALID_OPERAND">XPATH_INVALID_OPERAND</a> = 10 <a name="XPATH_INVALID_TYPE" id="XPATH_INVALID_TYPE">XPATH_INVALID_TYPE</a> = 11 <a name="XPATH_INVALID_ARITY" id="XPATH_INVALID_ARITY">XPATH_INVALID_ARITY</a> = 12 <a name="XPATH_INVALID_CTXT_SIZE" id="XPATH_INVALID_CTXT_SIZE">XPATH_INVALID_CTXT_SIZE</a> = 13 <a name="XPATH_INVALID_CTXT_POSITION" id="XPATH_INVALID_CTXT_POSITION">XPATH_INVALID_CTXT_POSITION</a> = 14 <a name="XPATH_MEMORY_ERROR" id="XPATH_MEMORY_ERROR">XPATH_MEMORY_ERROR</a> = 15 <a name="XPTR_SYNTAX_ERROR" id="XPTR_SYNTAX_ERROR">XPTR_SYNTAX_ERROR</a> = 16 <a name="XPTR_RESOURCE_ERROR" id="XPTR_RESOURCE_ERROR">XPTR_RESOURCE_ERROR</a> = 17 <a name="XPTR_SUB_RESOURCE_ERROR" id="XPTR_SUB_RESOURCE_ERROR">XPTR_SUB_RESOURCE_ERROR</a> = 18 <a name="XPATH_UNDEF_PREFIX_ERROR" id="XPATH_UNDEF_PREFIX_ERROR">XPATH_UNDEF_PREFIX_ERROR</a> = 19 <a name="XPATH_ENCODING_ERROR" id="XPATH_ENCODING_ERROR">XPATH_ENCODING_ERROR</a> = 20 <a name="XPATH_INVALID_CHAR_ERROR" id="XPATH_INVALID_CHAR_ERROR">XPATH_INVALID_CHAR_ERROR</a> = 21 <a name="XPATH_INVALID_CTXT" id="XPATH_INVALID_CTXT">XPATH_INVALID_CTXT</a> = 22 <a name="XPATH_STACK_ERROR" id="XPATH_STACK_ERROR">XPATH_STACK_ERROR</a> = 23 <a name="XPATH_FORBID_VARIABLE_ERROR" id="XPATH_FORBID_VARIABLE_ERROR">XPATH_FORBID_VARIABLE_ERROR</a> = 24 <a name="XPATH_OP_LIMIT_EXCEEDED" id="XPATH_OP_LIMIT_EXCEEDED">XPATH_OP_LIMIT_EXCEEDED</a> = 25 <a name="XPATH_RECURSION_LIMIT_EXCEEDED" id="XPATH_RECURSION_LIMIT_EXCEEDED">XPATH_RECURSION_LIMIT_EXCEEDED</a> = 26
} </pre><h3><a name=“xmlXPathFunct” id=“xmlXPathFunct”>Structure xmlXPathFunct</a></h3><pre class=“programlisting”>Structure xmlXPathFunct<br />struct _xmlXPathFunct {
const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> * name : the function name <a href="libxml-xpath.html#xmlXPathEvalFunc">xmlXPathEvalFunc</a> func : the evaluation function
}</pre><h3><a name=“xmlXPathObject” id=“xmlXPathObject”>Structure xmlXPathObject</a></h3><pre class=“programlisting”>Structure xmlXPathObject<br />struct _xmlXPathObject {
<a href="libxml-xpath.html#xmlXPathObjectType">xmlXPathObjectType</a> type <a href="libxml-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodesetval int boolval double floatval <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> * stringval void * user int index void * user2 int index2
}</pre><h3>Enum <a name=“xmlXPathObjectType” id=“xmlXPathObjectType”>xmlXPathObjectType</a></h3><pre class=“programlisting”>Enum xmlXPathObjectType {
<a name="XPATH_UNDEFINED" id="XPATH_UNDEFINED">XPATH_UNDEFINED</a> = 0 <a name="XPATH_NODESET" id="XPATH_NODESET">XPATH_NODESET</a> = 1 <a name="XPATH_BOOLEAN" id="XPATH_BOOLEAN">XPATH_BOOLEAN</a> = 2 <a name="XPATH_NUMBER" id="XPATH_NUMBER">XPATH_NUMBER</a> = 3 <a name="XPATH_STRING" id="XPATH_STRING">XPATH_STRING</a> = 4 <a name="XPATH_POINT" id="XPATH_POINT">XPATH_POINT</a> = 5 <a name="XPATH_RANGE" id="XPATH_RANGE">XPATH_RANGE</a> = 6 <a name="XPATH_LOCATIONSET" id="XPATH_LOCATIONSET">XPATH_LOCATIONSET</a> = 7 <a name="XPATH_USERS" id="XPATH_USERS">XPATH_USERS</a> = 8 <a name="XPATH_XSLT_TREE" id="XPATH_XSLT_TREE">XPATH_XSLT_TREE</a> = 9 : An XSLT value tree, non modifiable
} </pre><h3><a name=“xmlXPathParserContext” id=“xmlXPathParserContext”>Structure xmlXPathParserContext</a></h3><pre class=“programlisting”>Structure xmlXPathParserContext<br />struct _xmlXPathParserContext {
const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> * cur : the current char being parsed const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> * base : the full expression int error : error code <a href="libxml-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> context : the evaluation context <a href="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> value : the current value int valueNr : number of values stacked int valueMax : max number of values stacked <a href="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> * valueTab : stack of values <a href="libxml-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp : the precompiled expression int xptr : it this an XPointer expression <a href="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> ancestor : used for walking preceding axis int valueFrame : used to limit Pop on the stack
}</pre><h3><a name=“xmlXPathType” id=“xmlXPathType”>Structure xmlXPathType</a></h3><pre class=“programlisting”>Structure xmlXPathType<br />struct _xmlXPathType {
const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> * name : the type name <a href="libxml-xpath.html#xmlXPathConvertFunc">xmlXPathConvertFunc</a> func : the conversion function
}</pre><h3><a name=“xmlXPathVariable” id=“xmlXPathVariable”>Structure xmlXPathVariable</a></h3><pre class=“programlisting”>Structure xmlXPathVariable<br />struct _xmlXPathVariable {
const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> * name : the variable name <a href="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> value : the value
}</pre><h3><a name=“xmlXPathAxisFunc”
id=“xmlXPathAxisFunc”></a>Function type:
xmlXPathAxisFunc</h3><pre class=“programlisting”>Function type:
xmlXPathAxisFunc <a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
xmlXPathAxisFunc (<a
href=“libxml-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a>
ctxt, <br /> <a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
cur) </pre><p>An axis traversal function. To traverse an axis,
the engine calls the first time with cur == NULL and repeat until the
function returns NULL indicating the end of the axis
traversal.</p><div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath interpreter context</td></tr><tr><td><span
class=“term”>cur
:</span></td><td>the
previous node being explored on that
axis</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
next node in that axis or NULL if at the end of the
axis.</td></tr></tbody></table></div><br
/> <h3><a name=“xmlXPathCastBooleanToNumber”
id=“xmlXPathCastBooleanToNumber”></a>Function:
xmlXPathCastBooleanToNumber</h3><pre
class=“programlisting”>double xmlXPathCastBooleanToNumber (int
val)<br /> </pre><p>Converts a boolean to its number
value</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>a
boolean</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
number
value</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastBooleanToString”
id=“xmlXPathCastBooleanToString”></a>Function:
xmlXPathCastBooleanToString</h3><pre
class=“programlisting”><a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> *
xmlXPathCastBooleanToString (int val)<br />
</pre><p>Converts a boolean to its string value.</p>
<div class=“variablelist”><table border=“0”><col
align=“left” /><tbody><tr><td><span
class=“term”>val
:</span></td><td>a
boolean</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>a
newly allocated
string.</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastNodeSetToBoolean”
id=“xmlXPathCastNodeSetToBoolean”></a>Function:
xmlXPathCastNodeSetToBoolean</h3><pre
class=“programlisting”>int xmlXPathCastNodeSetToBoolean (<a
href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> ns)<br
/> </pre><p>Converts a node-set to its boolean
value</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><tr><td><span
class=“term”>Returns
:</span></td><td>the
boolean
value</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastNodeSetToNumber”
id=“xmlXPathCastNodeSetToNumber”></a>Function:
xmlXPathCastNodeSetToNumber</h3><pre
class=“programlisting”>double xmlXPathCastNodeSetToNumber
(<a href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a>
ns)<br /> </pre><p>Converts a node-set to its number
value</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><tr><td><span
class=“term”>Returns
:</span></td><td>the
number
value</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastNodeSetToString”
id=“xmlXPathCastNodeSetToString”></a>Function:
xmlXPathCastNodeSetToString</h3><pre
class=“programlisting”><a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> *
xmlXPathCastNodeSetToString (<a
href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> ns)<br
/> </pre><p>Converts a node-set to its string
value.</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><tr><td><span
class=“term”>Returns
:</span></td><td>a
newly allocated
string.</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastNodeToNumber”
id=“xmlXPathCastNodeToNumber”></a>Function:
xmlXPathCastNodeToNumber</h3><pre class=“programlisting”>double
xmlXPathCastNodeToNumber (<a
href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node)<br
/> </pre><p>Converts a node to its number value</p>
<div class=“variablelist”><table border=“0”><col
align=“left” /><tbody><tr><td><span
class=“term”>node
:</span></td><td>a
node</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
number
value</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastNodeToString”
id=“xmlXPathCastNodeToString”></a>Function:
xmlXPathCastNodeToString</h3><pre class=“programlisting”><a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> *
xmlXPathCastNodeToString (<a
href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node)<br
/> </pre><p>Converts a node to its string value.</p>
<div class=“variablelist”><table border=“0”><col
align=“left” /><tbody><tr><td><span
class=“term”>node
:</span></td><td>a
node</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>a
newly allocated
string.</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastNumberToBoolean”
id=“xmlXPathCastNumberToBoolean”></a>Function:
xmlXPathCastNumberToBoolean</h3><pre class=“programlisting”>int
xmlXPathCastNumberToBoolean (double val)<br />
</pre><p>Converts a number to its boolean value</p>
<div class=“variablelist”><table border=“0”><col
align=“left” /><tbody><tr><td><span
class=“term”>val
:</span></td><td>a
number</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
boolean
value</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastNumberToString”
id=“xmlXPathCastNumberToString”></a>Function:
xmlXPathCastNumberToString</h3><pre
class=“programlisting”><a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> *
xmlXPathCastNumberToString (double val)<br />
</pre><p>Converts a number to its string value.</p>
<div class=“variablelist”><table border=“0”><col
align=“left” /><tbody><tr><td><span
class=“term”>val
:</span></td><td>a
number</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>a
newly allocated
string.</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastStringToBoolean”
id=“xmlXPathCastStringToBoolean”></a>Function:
xmlXPathCastStringToBoolean</h3><pre class=“programlisting”>int
xmlXPathCastStringToBoolean (const <a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * val)<br
/> </pre><p>Converts a string to its boolean value</p>
<div class=“variablelist”><table border=“0”><col
align=“left” /><tbody><tr><td><span
class=“term”>val
:</span></td><td>a
string</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
boolean
value</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastStringToNumber”
id=“xmlXPathCastStringToNumber”></a>Function:
xmlXPathCastStringToNumber</h3><pre
class=“programlisting”>double xmlXPathCastStringToNumber (const
<a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> *
val)<br /> </pre><p>Converts a string to its number
value</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>a
string</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
number
value</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastToBoolean”
id=“xmlXPathCastToBoolean”></a>Function:
xmlXPathCastToBoolean</h3><pre class=“programlisting”>int
xmlXPathCastToBoolean (<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
val)<br /> </pre><p>Converts an XPath object to its
boolean value</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>an
XPath object</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
boolean
value</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastToNumber”
id=“xmlXPathCastToNumber”></a>Function:
xmlXPathCastToNumber</h3><pre class=“programlisting”>double
xmlXPathCastToNumber (<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
val)<br /> </pre><p>Converts an XPath object to its
number value</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>an
XPath object</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
number
value</td></tr></tbody></table></div><h3><a
name=“xmlXPathCastToString”
id=“xmlXPathCastToString”></a>Function:
xmlXPathCastToString</h3><pre class=“programlisting”><a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> *
xmlXPathCastToString (<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
val)<br /> </pre><p>Converts an existing object to its
string() equivalent</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>an
XPath object</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
allocated string value of the object, NULL in case of error. It's up to
the caller to free the string memory with
xmlFree().</td></tr></tbody></table></div><h3><a
name=“xmlXPathCmpNodes” id=“xmlXPathCmpNodes”></a>Function:
xmlXPathCmpNodes</h3><pre class=“programlisting”>int
xmlXPathCmpNodes (<a
href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node1, <br
/> <a
href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node2)<br
/> </pre><p>Compare two nodes w.r.t document order</p>
<div class=“variablelist”><table border=“0”><col
align=“left” /><tbody><tr><td><span
class=“term”>node1
:</span></td><td>the
first node</td></tr><tr><td><span
class=“term”>node2
:</span></td><td>the
second node</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>-2
in case of error 1 if first point < second point, 0 if it's the
same node, -1
otherwise</td></tr></tbody></table></div><h3><a
name=“xmlXPathCompile” id=“xmlXPathCompile”></a>Function:
xmlXPathCompile</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a>
xmlXPathCompile (const <a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * str)<br
/> </pre><p>Compile an XPath expression</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”>Returns
:</span></td><td>the
<a
href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a>
resulting from the compilation or NULL. the caller has to free the
object.</td></tr></tbody></table></div><h3><a
name=“xmlXPathCompiledEval”
id=“xmlXPathCompiledEval”></a>Function:
xmlXPathCompiledEval</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
xmlXPathCompiledEval (<a
href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a>
comp, <br /> <a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
ctx)<br /> </pre><p>Evaluate the Precompiled XPath
expression in the given context.</p> <div
class=“variablelist”><table border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>comp
:</span></td><td>the
compiled XPath expression</td></tr><tr><td><span
class=“term”>ctx
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
resulting from the evaluation or NULL. the caller has to free the
object.</td></tr></tbody></table></div><h3><a
name=“xmlXPathCompiledEvalToBoolean”
id=“xmlXPathCompiledEvalToBoolean”></a>Function:
xmlXPathCompiledEvalToBoolean</h3><pre
class=“programlisting”>int xmlXPathCompiledEvalToBoolean (<a
href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a>
comp, <br /> <a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
ctxt)<br /> </pre><p>Applies the XPath boolean() function
on the result of the given compiled expression.</p> <div
class=“variablelist”><table border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>comp
:</span></td><td>the
compiled 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>1
if the expression evaluated to true, 0 if to false and -1 in API and
internal
errors.</td></tr></tbody></table></div><h3><a
name=“xmlXPathContextSetCache”
id=“xmlXPathContextSetCache”></a>Function:
xmlXPathContextSetCache</h3><pre class=“programlisting”>int
xmlXPathContextSetCache (<a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
ctxt, <br /> int active, <br
/> int value, <br />
int options)<br /> </pre><p>Creates/frees an object cache
on the XPath context. If activates XPath objects (xmlXPathObject) will be
cached internally to be reused. @options: 0: This will set the XPath object
caching: @value: This will set the maximum number of XPath objects to be
cached per slot There are 5 slots for: node-set, string, number, boolean,
and misc objects. Use <0 for the default number (100). Other values
for @options have currently no effect.</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”>active
:</span></td><td>enables/disables
(creates/frees) the cache</td></tr><tr><td><span
class=“term”>value
:</span></td><td>a
value with semantics dependent on
@options</td></tr><tr><td><span
class=“term”>options
:</span></td><td>options
(currently only the value 0 is
used)</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>0
if the setting succeeded, and -1 on API or internal
errors.</td></tr></tbody></table></div><h3><a
name=“xmlXPathConvertBoolean”
id=“xmlXPathConvertBoolean”></a>Function:
xmlXPathConvertBoolean</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
xmlXPathConvertBoolean (<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
val)<br /> </pre><p>Converts an existing object to its
boolean() equivalent</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>an
XPath object</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
new object, the old one is freed (or the operation is done directly on
@val)</td></tr></tbody></table></div><h3><a
name=“xmlXPathConvertFunc” id=“xmlXPathConvertFunc”></a>Function
type: xmlXPathConvertFunc</h3><pre
class=“programlisting”>Function type: xmlXPathConvertFunc int
xmlXPathConvertFunc (<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
obj, <br /> int type)
</pre><p>A conversion function is associated to a type and used
to cast the new type to primitive values.</p><div
class=“variablelist”><table border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>obj
:</span></td><td>an
XPath object</td></tr><tr><td><span
class=“term”>type
:</span></td><td>the
number of the target type</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>-1
in case of error, 0
otherwise</td></tr></tbody></table></div><br
/> <h3><a name=“xmlXPathConvertNumber”
id=“xmlXPathConvertNumber”></a>Function:
xmlXPathConvertNumber</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
xmlXPathConvertNumber (<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
val)<br /> </pre><p>Converts an existing object to its
number() equivalent</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>an
XPath object</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
new object, the old one is freed (or the operation is done directly on
@val)</td></tr></tbody></table></div><h3><a
name=“xmlXPathConvertString”
id=“xmlXPathConvertString”></a>Function:
xmlXPathConvertString</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
xmlXPathConvertString (<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
val)<br /> </pre><p>Converts an existing object to its
string() equivalent</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>an
XPath object</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
new object, the old one is freed (or the operation is done directly on
@val)</td></tr></tbody></table></div><h3><a
name=“xmlXPathCtxtCompile” id=“xmlXPathCtxtCompile”></a>Function:
xmlXPathCtxtCompile</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a>
xmlXPathCtxtCompile (<a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
ctxt, <br /> const <a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * str)<br
/> </pre><p>Compile an XPath expression</p> <div
class=“variablelist”><table border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath context</td></tr><tr><td><span
class=“term”>str
:</span></td><td>the
XPath expression</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
<a
href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a>
resulting from the compilation or NULL. the caller has to free the
object.</td></tr></tbody></table></div><h3><a
name=“xmlXPathEval” id=“xmlXPathEval”></a>Function:
xmlXPathEval</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
xmlXPathEval (const <a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * str, <br
/> <a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
ctx)<br /> </pre><p>Evaluate the XPath Location Path in
the given context.</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”>ctx
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
resulting from the evaluation or NULL. the caller has to free the
object.</td></tr></tbody></table></div><h3><a
name=“xmlXPathEvalExpression”
id=“xmlXPathEvalExpression”></a>Function:
xmlXPathEvalExpression</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
xmlXPathEvalExpression (const <a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * str, <br
/> <a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
ctxt)<br /> </pre><p>Alias for xmlXPathEval().</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=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
resulting from the evaluation or NULL. the caller has to free the
object.</td></tr></tbody></table></div><h3><a
name=“xmlXPathEvalFunc” id=“xmlXPathEvalFunc”></a>Function type:
xmlXPathEvalFunc</h3><pre class=“programlisting”>Function type:
xmlXPathEvalFunc void xmlXPathEvalFunc (<a
href=“libxml-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a>
ctxt, <br /> int nargs)
</pre><p>An XPath evaluation function, the parameters are on
the XPath 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”>nargs
:</span></td><td>the
number of arguments passed to the
function</td></tr></tbody></table></div><br
/> <h3><a name=“xmlXPathEvalPredicate”
id=“xmlXPathEvalPredicate”></a>Function:
xmlXPathEvalPredicate</h3><pre class=“programlisting”>int
xmlXPathEvalPredicate (<a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
ctxt, <br /> <a
href=“libxml-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 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><h3><a
name=“xmlXPathFreeCompExpr”
id=“xmlXPathFreeCompExpr”></a>Function:
xmlXPathFreeCompExpr</h3><pre class=“programlisting”>void
xmlXPathFreeCompExpr (<a
href=“libxml-xpath.html#xmlXPathCompExprPtr”>xmlXPathCompExprPtr</a>
comp)<br /> </pre><p>Free up the memory allocated by
@comp</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>comp
:</span></td><td>an
XPATH
comp</td></tr></tbody></table></div><h3><a
name=“xmlXPathFreeContext” id=“xmlXPathFreeContext”></a>Function:
xmlXPathFreeContext</h3><pre class=“programlisting”>void
xmlXPathFreeContext (<a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
ctxt)<br /> </pre><p>Free up an <a
href=“libxml-xpath.html#xmlXPathContext”>xmlXPathContext</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><h3><a
name=“xmlXPathFreeNodeSet” id=“xmlXPathFreeNodeSet”></a>Function:
xmlXPathFreeNodeSet</h3><pre class=“programlisting”>void
xmlXPathFreeNodeSet (<a
href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a>
obj)<br /> </pre><p>Free the NodeSet compound (not the
actual nodes !).</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>obj
:</span></td><td>the
<a href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a> to
free</td></tr></tbody></table></div><h3><a
name=“xmlXPathFreeNodeSetList”
id=“xmlXPathFreeNodeSetList”></a>Function:
xmlXPathFreeNodeSetList</h3><pre class=“programlisting”>void
xmlXPathFreeNodeSetList (<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
obj)<br /> </pre><p>Free up the <a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
@obj but don't deallocate the objects in the list contrary to
xmlXPathFreeObject().</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>obj
:</span></td><td>an
existing NodeSetList
object</td></tr></tbody></table></div><h3><a
name=“xmlXPathFreeObject” id=“xmlXPathFreeObject”></a>Function:
xmlXPathFreeObject</h3><pre class=“programlisting”>void
xmlXPathFreeObject (<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
obj)<br /> </pre><p>Free up an <a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
object.</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>obj
:</span></td><td>the
object to
free</td></tr></tbody></table></div><h3><a
name=“xmlXPathFuncLookupFunc”
id=“xmlXPathFuncLookupFunc”></a>Function type:
xmlXPathFuncLookupFunc</h3><pre class=“programlisting”>Function
type: xmlXPathFuncLookupFunc <a
href=“libxml-xpath.html#xmlXPathFunction”>xmlXPathFunction</a>
xmlXPathFuncLookupFunc (void * ctxt, <br />
const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> *
name, <br /> const
<a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * ns_uri)
</pre><p>Prototype for callbacks used to plug function lookup
in the XPath engine.</p><div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath context</td></tr><tr><td><span
class=“term”>name
:</span></td><td>name
of the function</td></tr><tr><td><span
class=“term”>ns_uri
:</span></td><td>the
namespace name hosting this
function</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
XPath function or NULL if not
found.</td></tr></tbody></table></div><br
/> <h3><a name=“xmlXPathFunction”
id=“xmlXPathFunction”></a>Function type:
xmlXPathFunction</h3><pre class=“programlisting”>Function type:
xmlXPathFunction void xmlXPathFunction (<a
href=“libxml-xpath.html#xmlXPathParserContextPtr”>xmlXPathParserContextPtr</a>
ctxt, <br /> int nargs)
</pre><p>An XPath function. The arguments (if any) are popped
out from the context stack and the result is pushed on the
stack.</p><div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>the
XPath interprestation
context</td></tr><tr><td><span
class=“term”>nargs
:</span></td><td>the
number of
arguments</td></tr></tbody></table></div><br
/> <h3><a name=“xmlXPathInit”
id=“xmlXPathInit”></a>Function: xmlXPathInit</h3><pre
class=“programlisting”>void xmlXPathInit
(void)<br /> </pre><p>Initialize the XPath
environment</p> <h3><a name=“xmlXPathIsInf”
id=“xmlXPathIsInf”></a>Function: xmlXPathIsInf</h3><pre
class=“programlisting”>int xmlXPathIsInf (double
val)<br /> </pre><p></p> <div
class=“variablelist”><table border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>a
double value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>1
if the value is +Infinite, -1 if -Infinite, 0
otherwise</td></tr></tbody></table></div><h3><a
name=“xmlXPathIsNaN” id=“xmlXPathIsNaN”></a>Function:
xmlXPathIsNaN</h3><pre class=“programlisting”>int
xmlXPathIsNaN (double val)<br />
</pre><p></p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>a
double value</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>1
if the value is a NaN, 0
otherwise</td></tr></tbody></table></div><h3><a
name=“xmlXPathNewContext” id=“xmlXPathNewContext”></a>Function:
xmlXPathNewContext</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
xmlXPathNewContext (<a
href=“libxml-tree.html#xmlDocPtr”>xmlDocPtr</a> doc)<br />
</pre><p>Create a new <a
href=“libxml-xpath.html#xmlXPathContext”>xmlXPathContext</a></p>
<div class=“variablelist”><table border=“0”><col
align=“left” /><tbody><tr><td><span
class=“term”>doc
:</span></td><td>the
XML document</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
<a href=“libxml-xpath.html#xmlXPathContext”>xmlXPathContext</a>
just allocated. The caller will need to free
it.</td></tr></tbody></table></div><h3><a
name=“xmlXPathNodeEval” id=“xmlXPathNodeEval”></a>Function:
xmlXPathNodeEval</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
xmlXPathNodeEval (<a
href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node, <br
/> const <a
href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> * str, <br
/> <a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
ctx)<br /> </pre><p>Evaluate the XPath Location Path in
the given context. The node 'node' is set as the context node. The
context node is not restored.</p> <div
class=“variablelist”><table border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>node
:</span></td><td>the
node to to use as the context
node</td></tr><tr><td><span
class=“term”>str
:</span></td><td>the
XPath expression</td></tr><tr><td><span
class=“term”>ctx
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
resulting from the evaluation or NULL. the caller has to free the
object.</td></tr></tbody></table></div><h3><a
name=“xmlXPathNodeSetCreate”
id=“xmlXPathNodeSetCreate”></a>Function:
xmlXPathNodeSetCreate</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</a>
xmlXPathNodeSetCreate (<a
href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> val)<br />
</pre><p>Create a new <a
href=“libxml-xpath.html#xmlNodeSetPtr”>xmlNodeSetPtr</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>an
initial xmlNodePtr, or
NULL</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div><h3><a
name=“xmlXPathObjectCopy” id=“xmlXPathObjectCopy”></a>Function:
xmlXPathObjectCopy</h3><pre class=“programlisting”><a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
xmlXPathObjectCopy (<a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
val)<br /> </pre><p>allocate a new copy of a given
object</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>val
:</span></td><td>the
original object</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
newly created
object.</td></tr></tbody></table></div><h3><a
name=“xmlXPathOrderDocElems”
id=“xmlXPathOrderDocElems”></a>Function:
xmlXPathOrderDocElems</h3><pre class=“programlisting”>long
xmlXPathOrderDocElems (<a
href=“libxml-tree.html#xmlDocPtr”>xmlDocPtr</a> doc)<br />
</pre><p>Call this routine to speed up XPath computation on
static documents. This stamps all the element nodes with the document order
Like for line information, the order is kept in the element->content
field, the value stored is actually - the node number (starting at -1) to
be able to differentiate from line numbers.</p> <div
class=“variablelist”><table border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>doc
:</span></td><td>an
input document</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
number of elements found in the document or -1 in case of
error.</td></tr></tbody></table></div><h3><a
name=“xmlXPathSetContextNode”
id=“xmlXPathSetContextNode”></a>Function:
xmlXPathSetContextNode</h3><pre class=“programlisting”>int
xmlXPathSetContextNode (<a
href=“libxml-tree.html#xmlNodePtr”>xmlNodePtr</a> node, <br
/> <a
href=“libxml-xpath.html#xmlXPathContextPtr”>xmlXPathContextPtr</a>
ctx)<br /> </pre><p>Sets 'node' as the context
node. The node must be in the same document as that associated with the
context.</p> <div class=“variablelist”><table
border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>node
:</span></td><td>the
node to to use as the context
node</td></tr><tr><td><span
class=“term”>ctx
:</span></td><td>the
XPath context</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>-1
in case of error or 0 if
successful</td></tr></tbody></table></div><h3><a
name=“xmlXPathVariableLookupFunc”
id=“xmlXPathVariableLookupFunc”></a>Function type:
xmlXPathVariableLookupFunc</h3><pre
class=“programlisting”>Function type: xmlXPathVariableLookupFunc <a
href=“libxml-xpath.html#xmlXPathObjectPtr”>xmlXPathObjectPtr</a>
xmlXPathVariableLookupFunc (void * ctxt, <br />
const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> *
name, <br />
const <a href=“libxml-xmlstring.html#xmlChar”>xmlChar</a> *
ns_uri) </pre><p>Prototype for callbacks used to plug variable
lookup in the XPath engine.</p><div
class=“variablelist”><table border=“0”><col align=“left”
/><tbody><tr><td><span
class=“term”>ctxt
:</span></td><td>an
XPath context</td></tr><tr><td><span
class=“term”>name
:</span></td><td>name
of the variable</td></tr><tr><td><span
class=“term”>ns_uri
:</span></td><td>the
namespace name hosting this
variable</td></tr><tr><td><span
class=“term”>Returns
:</span></td><td>the
XPath object value or NULL if not
found.</td></tr></tbody></table></div><br
/> <p><a href=“../bugs.html”>Daniel
Veillard</a></p></td></tr></table></td></tr></table></td></tr></table></td></tr></table></td></tr></table></body></html>