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=head1 NAME
XML::LibXML::PI - XML::LibXML Processing Instructions
=head1 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 [...] );
=head1 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 L<<<<<< 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.
L<<<<<< XML::LibXML::PI >>>>>>'s implementation of setData() documented below differs a bit from the the
standard version as available in L<<<<<< XML::LibXML::Node >>>>>>:
=over 4
=item 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.
=back
=head1 AUTHORS
Matt Sergeant,
Christian Glahn,
Petr Pajas
=head1 VERSION
2.0001
=head1 COPYRIGHT
2001-2007, AxKit.com Ltd.
2002-2006, Christian Glahn.
2006-2009, Petr Pajas.
=cut
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