XML::LibXML::PI - XML::LibXML Processing Instructions
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 [...] );
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 ) 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
will have the same result as above.
$pinode->setData( $data_string ); $pinode->setData( name=>string_value [...] );
This method allows 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.
Matt Sergeant, Christian Glahn, Petr Pajas
2001-2007, AxKit.com Ltd; 2002-2006 Christian Glahn; 2006-2008 Petr Pajas, All rights reserved.