# XML::LibXML::PI - phpMan

## NAME
    [XML::LibXML::PI] - [XML::LibXML] Processing Instructions

## SYNOPSIS
      use [XML::LibXML];
      # Only methods specific to Processing Instruction nodes are listed here,
      # see the [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
    2.0134

## 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.