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XML::LibXML::XPathExpression.3pm

NAME

XML::LibXML::XPathExpression - XML::LibXML::XPathExpression - interface to libxml2 pre-compiled XPath expressions

SYNOPSIS

   use XML::LibXML;
   my $compiled_xpath = new XML::LibXML::XPathExpression('//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 );
 
 

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. "XML::LibXML::XPathExpression" objects can be passed to all "find..." functions "XML::LibXML" that expect an XPath expression.

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).

AUTHORS

Matt Sergeant, Christian Glahn, Petr Pajas

VERSION

1.70

COPYRIGHT

2001-2007, AxKit.com Ltd.

2002-2006, Christian Glahn.

2006-2009, Petr Pajas.