Processing Instruction: Difference between revisions

Revision as of 12:54, 21 March 2013

Revision as of 14:14, 26 March 2014

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== Examples ==

The most common use of a processing instruction is to request the XML document be rendered using a [[stylesheet]] using the 'xml-stylesheet' target, which was standardized in 1999.<ref>[http://www.w3.org/TR/xml-stylesheet/]</ref> It can be used for both [[XSLT]] and [[Cascading Style Sheet|CSS]] stylesheets.

<source lang="xml"><?xml-stylesheet type="text/xsl" href="style.xsl"?></source>

<source lang="xml"><?xml-stylesheet type="text/css" href="style.css"?></source>

Another use is the [[programming language]] [[PHP]], which can be embedded within an (X)[[HTML]] document as shown in the following example.<ref name="nutshell">{{cite book | title = XML in a nutshell | author = Elliotte Rusty Harold, W. Scott Means | isbn = 978-0-596-00764-5 | page = 23 }}</ref>

<source lang="php"><?php echo $a; ?></source>

The [[DocBook]] XSLT stylesheets understand a number of processing instructions to override the default behaviour.<ref>[http://docbook.sourceforge.net/release/xsl/current/doc/pi/pi-fo.html]</ref>

A draft specification for [[Robots exclusion standard]] rules inside XML documents uses processing instructions.<ref>[http://www.atrus.org/writings/technical/robots_pi/]</ref>

== References ==