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=head1 NAME XML::LibXML::XPathExpression - XML::LibXML::XPathExpression - interface to libxml2 pre-compiled XPath expressions =head1 SYNOPSIS use XML::LibXML; my $compiled_xpath = XML::LibXML::XPathExpression->new('//foo[@bar="baz"][position()<4]'); # interface from XML::LibXML::Node my $result = $node->find($compiled_xpath); my @nodes = $node->findnodes($compiled_xpath); my $value = $node->findvalue($compiled_xpath); # interface from XML::LibXML::XPathContext my $result = $xpc->find($compiled_xpath,$node); my @nodes = $xpc->findnodes($compiled_xpath,$node); my $value = $xpc->findvalue($compiled_xpath,$node); $compiled = XML::LibXML::XPathExpression->new( xpath_string ); =head1 DESCRIPTION This is a perl interface to libxml2's pre-compiled XPath expressions. Pre-compiling an XPath expression can give in some performance benefit if the same XPath query is evaluated many times. C<<<<<< XML::LibXML::XPathExpression >>>>>> objects can be passed to all C<<<<<< find... >>>>>> functions C<<<<<< XML::LibXML >>>>>> that expect an XPath expression. =over 4 =item new() $compiled = XML::LibXML::XPathExpression->new( xpath_string ); The constructor takes an XPath 1.0 expression as a string and returns an object representing the pre-compiled expressions (the actual data structure is internal to libxml2). =back =head1 AUTHORS Matt Sergeant, Christian Glahn, Petr Pajas =head1 VERSION 2.0018 =head1 COPYRIGHT 2001-2007, AxKit.com Ltd. 2002-2006, Christian Glahn. 2006-2009, Petr Pajas. =cut