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[catagits/Gitalist.git] / local-lib5 / man / man3 / XML::LibXML::XPathExpression.3pm

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.\" ========================================================================
.\"
.IX Title "XML::LibXML::XPathExpression 3"
.TH XML::LibXML::XPathExpression 3 "2009-10-07" "perl v5.8.7" "User Contributed Perl Documentation"
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.SH "NAME"
XML::LibXML::XPathExpression \- XML::LibXML::XPathExpression \- interface to libxml2 pre\-compiled XPath expressions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  use XML::LibXML;
\&  my $compiled_xpath = new XML::LibXML::XPathExpression(\*(Aq//foo[@bar="baz"][position()<4]\*(Aq);
\&
\&  # 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 );
.Ve
.SH "DESCRIPTION"
.IX Header "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. \f(CW\*(C`XML::LibXML::XPathExpression\*(C'\fR objects can be passed to all \f(CW\*(C`find...\*(C'\fR functions \f(CW\*(C`XML::LibXML\*(C'\fR that expect an XPath expression.
.IP "\fInew()\fR" 4
.IX Item "new()"
.Vb 1
\&  $compiled = XML::LibXML::XPathExpression\->new( xpath_string );
.Ve
.Sp
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).
.SH "AUTHORS"
.IX Header "AUTHORS"
Matt Sergeant, 
Christian Glahn, 
Petr Pajas
.SH "VERSION"
.IX Header "VERSION"
1.70
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
2001\-2007, AxKit.com Ltd.
.PP
2002\-2006, Christian Glahn.
.PP
2006\-2009, Petr Pajas.