XML::LibXML::XPathExpression(3p)

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
1.66

COPYRIGHT
2001-2007, AxKit.com Ltd; 2002-2006 Christian Glahn; 2006-2008 Petr Pajas, All rights reserved.