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XML::LibXML::PI.3pm

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 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. 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

1.70

COPYRIGHT

2001-2007, AxKit.com Ltd.

2002-2006, Christian Glahn.

2006-2009, Petr Pajas.