phpman > perldoc > XML::LibXML::XPathExpression

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

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 );

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
    2.0134

COPYRIGHT
    2001-2007, AxKit.com Ltd.

    2002-2006, Christian Glahn.

    2006-2009, Petr Pajas.

LICENSE
    This program is free software; you can redistribute it and/or modify it under the same terms as
    Perl itself.