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<preclass="programlisting">int <ahref="#xmlXPathContextSetCache">xmlXPathContextSetCache</a> (<ahref="libxml-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> int active, <br/> int value, <br/> int options)</pre>
<h3><aname="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><aname="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><aname="xmlXPathNodeSetItem"id="xmlXPathNodeSetItem"></a>Macro: xmlXPathNodeSetItem</h3><pre>#define xmlXPathNodeSetItem</pre><p>Implements a functionality similar to the DOM NodeList.item(). Returns the <ahref="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>
</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><divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath interpreter context</td></tr><tr><td><spanclass="term"><i><tt>cur</tt></i>:</span></td><td>the previous node being explored on that axis</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the next node in that axis or NULL if at the end of the axis.</td></tr></tbody></table></div><br/>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>val</tt></i>:</span></td><td>an XPath object</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</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><aname="xmlXPathCmpNodes"id="xmlXPathCmpNodes"></a>Function: xmlXPathCmpNodes</h3><preclass="programlisting">int xmlXPathCmpNodes (<ahref="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> node1, <br/><ahref="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> node2)<br/>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>node1</tt></i>:</span></td><td>the first node</td></tr><tr><td><spanclass="term"><i><tt>node2</tt></i>:</span></td><td>the second node</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</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><aname="xmlXPathCompile"id="xmlXPathCompile"></a>Function: xmlXPathCompile</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> xmlXPathCompile (const <ahref="libxml-xmlstring.html#xmlChar">xmlChar</a> * str)<br/>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>str</tt></i>:</span></td><td>the XPath expression</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the <ahref="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><aname="xmlXPathCompiledEval"id="xmlXPathCompiledEval"></a>Function: xmlXPathCompiledEval</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathCompiledEval (<ahref="libxml-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp, <br/><ahref="libxml-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctx)<br/>
</pre><p>Evaluate the Precompiled XPath expression in the given context.</p>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>comp</tt></i>:</span></td><td>the compiled XPath expression</td></tr><tr><td><spanclass="term"><i><tt>ctx</tt></i>:</span></td><td>the XPath context</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the <ahref="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><aname="xmlXPathCompiledEvalToBoolean"id="xmlXPathCompiledEvalToBoolean"></a>Function: xmlXPathCompiledEvalToBoolean</h3><preclass="programlisting">int xmlXPathCompiledEvalToBoolean (<ahref="libxml-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> comp, <br/><ahref="libxml-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt)<br/>
</pre><p>Applies the XPath boolean() function on the result of the given compiled expression.</p>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>comp</tt></i>:</span></td><td>the compiled XPath expression</td></tr><tr><td><spanclass="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath context</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</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><aname="xmlXPathContextSetCache"id="xmlXPathContextSetCache"></a>Function: xmlXPathContextSetCache</h3><preclass="programlisting">int xmlXPathContextSetCache (<ahref="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>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath context</td></tr><tr><td><spanclass="term"><i><tt>active</tt></i>:</span></td><td>enables/disables (creates/frees) the cache</td></tr><tr><td><spanclass="term"><i><tt>value</tt></i>:</span></td><td>a value with semantics dependant on @options</td></tr><tr><td><spanclass="term"><i><tt>options</tt></i>:</span></td><td>options (currently only the value 0 is used)</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>0 if the setting succeeded, and -1 on API or internal errors.</td></tr></tbody></table></div><h3><aname="xmlXPathConvertBoolean"id="xmlXPathConvertBoolean"></a>Function: xmlXPathConvertBoolean</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathConvertBoolean (<ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val)<br/>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>val</tt></i>:</span></td><td>an XPath object</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</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><aname="xmlXPathConvertFunc"id="xmlXPathConvertFunc"></a>Function type: xmlXPathConvertFunc</h3><preclass="programlisting">Function type: xmlXPathConvertFunc
int xmlXPathConvertFunc (<ahref="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><divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>obj</tt></i>:</span></td><td>an XPath object</td></tr><tr><td><spanclass="term"><i><tt>type</tt></i>:</span></td><td>the number of the target type</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>-1 in case of error, 0 otherwise</td></tr></tbody></table></div><br/>
</pre><p>Converts an existing object to its number() equivalent</p>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>val</tt></i>:</span></td><td>an XPath object</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</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><aname="xmlXPathConvertString"id="xmlXPathConvertString"></a>Function: xmlXPathConvertString</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathConvertString (<ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val)<br/>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>val</tt></i>:</span></td><td>an XPath object</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</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><aname="xmlXPathCtxtCompile"id="xmlXPathCtxtCompile"></a>Function: xmlXPathCtxtCompile</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlXPathCompExprPtr">xmlXPathCompExprPtr</a> xmlXPathCtxtCompile (<ahref="libxml-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <ahref="libxml-xmlstring.html#xmlChar">xmlChar</a> * str)<br/>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath context</td></tr><tr><td><spanclass="term"><i><tt>str</tt></i>:</span></td><td>the XPath expression</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the <ahref="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><aname="xmlXPathEval"id="xmlXPathEval"></a>Function: xmlXPathEval</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathEval (const <ahref="libxml-xmlstring.html#xmlChar">xmlChar</a> * str, <br/><ahref="libxml-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctx)<br/>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>str</tt></i>:</span></td><td>the XPath expression</td></tr><tr><td><spanclass="term"><i><tt>ctx</tt></i>:</span></td><td>the XPath context</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the <ahref="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><aname="xmlXPathEvalExpression"id="xmlXPathEvalExpression"></a>Function: xmlXPathEvalExpression</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathEvalExpression (const <ahref="libxml-xmlstring.html#xmlChar">xmlChar</a> * str, <br/><ahref="libxml-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt)<br/>
</pre><p>Evaluate the XPath expression in the given context.</p>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>str</tt></i>:</span></td><td>the XPath expression</td></tr><tr><td><spanclass="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath context</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the <ahref="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><aname="xmlXPathEvalFunc"id="xmlXPathEvalFunc"></a>Function type: xmlXPathEvalFunc</h3><preclass="programlisting">Function type: xmlXPathEvalFunc
void xmlXPathEvalFunc (<ahref="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><divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr><tr><td><spanclass="term"><i><tt>nargs</tt></i>:</span></td><td>the number of arguments passed to the function</td></tr></tbody></table></div><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>
</pre><p>Free up an <ahref="libxml-xpath.html#xmlXPathContext">xmlXPathContext</a></p>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>ctxt</tt></i>:</span></td><td>the context to free</td></tr></tbody></table></div><h3><aname="xmlXPathFreeNodeSet"id="xmlXPathFreeNodeSet"></a>Function: xmlXPathFreeNodeSet</h3><preclass="programlisting">void xmlXPathFreeNodeSet (<ahref="libxml-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> obj)<br/>
</pre><p>Free the NodeSet compound (not the actual nodes !).</p>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>obj</tt></i>:</span></td><td>the <ahref="libxml-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> to free</td></tr></tbody></table></div><h3><aname="xmlXPathFreeNodeSetList"id="xmlXPathFreeNodeSetList"></a>Function: xmlXPathFreeNodeSetList</h3><preclass="programlisting">void xmlXPathFreeNodeSetList (<ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> obj)<br/>
</pre><p>Free up the <ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> @obj but don't deallocate the objects in the list contrary to xmlXPathFreeObject().</p>
</pre><p>Prototype for callbacks used to plug function lookup in the XPath engine.</p><divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath context</td></tr><tr><td><spanclass="term"><i><tt>name</tt></i>:</span></td><td>name of the function</td></tr><tr><td><spanclass="term"><i><tt>ns_uri</tt></i>:</span></td><td>the namespace name hosting this function</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the XPath function or NULL if not found.</td></tr></tbody></table></div><br/>
void xmlXPathFunction (<ahref="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><divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath interprestation context</td></tr><tr><td><spanclass="term"><i><tt>nargs</tt></i>:</span></td><td>the number of arguments</td></tr></tbody></table></div><br/>
</pre><p>Provides a portable isinf() function to detect whether a double is a +Infinite or -Infinite. Based on trio code http://sourceforge.net/projects/ctrio/</p>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>val</tt></i>:</span></td><td>a double value</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>1 vi the value is +Infinite, -1 if -Infinite, 0 otherwise</td></tr></tbody></table></div><h3><aname="xmlXPathIsNaN"id="xmlXPathIsNaN"></a>Function: xmlXPathIsNaN</h3><preclass="programlisting">int xmlXPathIsNaN (double val)<br/>
</pre><p>Provides a portable isnan() function to detect whether a double is a NotaNumber. Based on trio code http://sourceforge.net/projects/ctrio/</p>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>val</tt></i>:</span></td><td>a double value</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>1 if the value is a NaN, 0 otherwise</td></tr></tbody></table></div><h3><aname="xmlXPathNewContext"id="xmlXPathNewContext"></a>Function: xmlXPathNewContext</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> xmlXPathNewContext (<ahref="libxml-tree.html#xmlDocPtr">xmlDocPtr</a> doc)<br/>
</pre><p>Create a new <ahref="libxml-xpath.html#xmlXPathContext">xmlXPathContext</a></p>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>doc</tt></i>:</span></td><td>the XML document</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the <ahref="libxml-xpath.html#xmlXPathContext">xmlXPathContext</a> just allocated. The caller will need to free it.</td></tr></tbody></table></div><h3><aname="xmlXPathNodeEval"id="xmlXPathNodeEval"></a>Function: xmlXPathNodeEval</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathNodeEval (<ahref="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br/> const <ahref="libxml-xmlstring.html#xmlChar">xmlChar</a> * str, <br/><ahref="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>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>node</tt></i>:</span></td><td>the node to to use as the context node</td></tr><tr><td><spanclass="term"><i><tt>str</tt></i>:</span></td><td>the XPath expression</td></tr><tr><td><spanclass="term"><i><tt>ctx</tt></i>:</span></td><td>the XPath context</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the <ahref="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><aname="xmlXPathNodeSetCreate"id="xmlXPathNodeSetCreate"></a>Function: xmlXPathNodeSetCreate</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> xmlXPathNodeSetCreate (<ahref="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> val)<br/>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>val</tt></i>:</span></td><td>an initial xmlNodePtr, or NULL</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the newly created object.</td></tr></tbody></table></div><h3><aname="xmlXPathObjectCopy"id="xmlXPathObjectCopy"></a>Function: xmlXPathObjectCopy</h3><preclass="programlisting"><ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> xmlXPathObjectCopy (<ahref="libxml-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> val)<br/>
</pre><p>allocate a new copy of a given object</p>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>val</tt></i>:</span></td><td>the original object</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the newly created object.</td></tr></tbody></table></div><h3><aname="xmlXPathOrderDocElems"id="xmlXPathOrderDocElems"></a>Function: xmlXPathOrderDocElems</h3><preclass="programlisting">long xmlXPathOrderDocElems (<ahref="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>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>doc</tt></i>:</span></td><td>an input document</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the number of elements found in the document or -1 in case of error.</td></tr></tbody></table></div><h3><aname="xmlXPathSetContextNode"id="xmlXPathSetContextNode"></a>Function: xmlXPathSetContextNode</h3><preclass="programlisting">int xmlXPathSetContextNode (<ahref="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br/><ahref="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>
<divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>node</tt></i>:</span></td><td>the node to to use as the context node</td></tr><tr><td><spanclass="term"><i><tt>ctx</tt></i>:</span></td><td>the XPath context</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>-1 in case of error or 0 if successful</td></tr></tbody></table></div><h3><aname="xmlXPathVariableLookupFunc"id="xmlXPathVariableLookupFunc"></a>Function type: xmlXPathVariableLookupFunc</h3><preclass="programlisting">Function type: xmlXPathVariableLookupFunc
</pre><p>Prototype for callbacks used to plug variable lookup in the XPath engine.</p><divclass="variablelist"><tableborder="0"><colalign="left"/><tbody><tr><td><spanclass="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath context</td></tr><tr><td><spanclass="term"><i><tt>name</tt></i>:</span></td><td>name of the variable</td></tr><tr><td><spanclass="term"><i><tt>ns_uri</tt></i>:</span></td><td>the namespace name hosting this variable</td></tr><tr><td><spanclass="term"><i><tt>Returns</tt></i>:</span></td><td>the XPath object value or NULL if not found.</td></tr></tbody></table></div><br/>
