NAME

       XML::LibXML::PI - XML::LibXML Processing Instructions

SYNOPSIS

         use XML::LibXML;
         # Only methods specific to Processing Instruction nodes are listed here,
         # see XML::LibXML::Node manpage for other methods

         $pinode->setData( $data_string );
         $pinode->setData( name=>string_value [...] );

DESCRIPTION

       Processing instructions are implemented with XML::LibXML with read and write access. The
       PI data is the PI without the PI target (as specified in XML 1.0 [17]) as a string. This
       string can be accessed with getData as implemented in XML::LibXML::Node.

       The write access is aware about the fact, that many processing instructions have attribute
       like data. Therefore setData() provides besides the DOM spec conform Interface to pass a
       set of named parameter. So the code segment

         my $pi = $dom->createProcessingInstruction("abc");
         $pi->setData(foo=>'bar', foobar=>'foobar');
         $dom->appendChild( $pi );

       will result the following PI in the DOM:

         <?abc foo="bar" foobar="foobar"?>

       Which is how it is specified in the DOM specification. This three step interface creates
       temporary a node in perl space. This can be avoided while using the
       insertProcessingInstruction() method. Instead of the three calls described above, the call

         $dom->insertProcessingInstruction("abc",'foo="bar" foobar="foobar"');

       will have the same result as above.

       XML::LibXML::PI's implementation of setData() documented below differs a bit from the
       standard version as available in XML::LibXML::Node:

       setData
             $pinode->setData( $data_string );
             $pinode->setData( name=>string_value [...] );

           This method allows one to change the content data of a PI. Additionally to the
           interface specified for DOM Level2, the method provides a named parameter interface to
           set the data. This parameter list is converted into a string before it is appended to
           the PI.

AUTHORS

       Matt Sergeant, Christian Glahn, Petr Pajas

VERSION

       2.0108

COPYRIGHT

       2001-2007, AxKit.com Ltd.

       2002-2006, Christian Glahn.

       2006-2009, Petr Pajas.