man XML::LibXML::PI () - XML::LibXML Processing Instructions

NAME

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

SYNOPSIS

  $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() differs a bit from the the standard version as available in XML::LibXML::Node():

setData
  $pinode->setData( $data_string );
  $pinode->setData( name=>string_value [...] );
This method allows to change the content data of a PI. Additionaly to the interface specified for DOM Level2, the method provides a named parameter interface to set the data. This parameterlist is converted into a string before it is appended to the PI.

AUTHORS

Matt Sergeant, Christian Glahn, =head1 VERSION

1.58

COPYRIGHT

2001-2004, AxKit.com Ltd; 2002-2004 Christian Glahn, All rights reserved.