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.\" ========================================================================
.\"
.IX Title "XML::LibXML::PI 3pm"
.TH XML::LibXML::PI 3pm "2019-02-13" "perl v5.28.1" "User Contributed Perl Documentation"
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.SH "NAME"
XML::LibXML::PI \- XML::LibXML Processing Instructions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&  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 [...] );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Processing instructions are implemented with XML::LibXML with read and write
access. The \s-1PI\s0 data is the \s-1PI\s0 without the \s-1PI\s0 target (as specified in \s-1XML 1.0\s0
[17]) as a string. This string can be accessed with getData as implemented in XML::LibXML::Node.
.PP
The write access is aware about the fact, that many processing instructions
have attribute like data. Therefore \fBsetData()\fR provides besides the \s-1DOM\s0 spec
conform Interface to pass a set of named parameter. So the code segment
.PP
.Vb 3
\&  my $pi = $dom\->createProcessingInstruction("abc");
\&  $pi\->setData(foo=>\*(Aqbar\*(Aq, foobar=>\*(Aqfoobar\*(Aq);
\&  $dom\->appendChild( $pi );
.Ve
.PP
will result the following \s-1PI\s0 in the \s-1DOM:\s0
.PP
.Vb 1
\&  <?abc foo="bar" foobar="foobar"?>
.Ve
.PP
Which is how it is specified in the \s-1DOM\s0 specification. This three step
interface creates temporary a node in perl space. This can be avoided while
using the \fBinsertProcessingInstruction()\fR method. Instead of the three calls
described above, the call
.PP
.Vb 1
\&  $dom\->insertProcessingInstruction("abc",\*(Aqfoo="bar" foobar="foobar"\*(Aq);
.Ve
.PP
will have the same result as above.
.PP
XML::LibXML::PI's implementation of \fBsetData()\fR documented below differs a bit from the standard
version as available in XML::LibXML::Node:
.IP "setData" 4
.IX Item "setData"
.Vb 2
\&  $pinode\->setData( $data_string );
\&  $pinode\->setData( name=>string_value [...] );
.Ve
.Sp
This method allows one to change the content data of a \s-1PI.\s0 Additionally to the
interface specified for \s-1DOM\s0 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 \s-1PI.\s0
.SH "AUTHORS"
.IX Header "AUTHORS"
Matt Sergeant,
Christian Glahn,
Petr Pajas
.SH "VERSION"
.IX Header "VERSION"
2.0134
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
2001\-2007, AxKit.com Ltd.
.PP
2002\-2006, Christian Glahn.
.PP
2006\-2009, Petr Pajas.
.SH "LICENSE"
.IX Header "LICENSE"
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.