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Line 1: A '''Processing Instruction''' ('''PI''') is an [[SGML]] and [[XML]] node type, which may occur anywhere in the document, intended to carry instructions to the application.<ref>[{{Cite book \|last=Stayton \|first=Bob \|title=DocBook XSL: The Complete Guide \|chapter-url=http://www.sagehill.net/docbookxsl/ProcessingInstructions.html \|publisher=Sagehill Enterprises \|date=September 2007 \|chapter=Chapter 9. Customization methods: §Processing instructions] \|isbn=978-0974152134}}</ref><ref>[http://www.w3.org/TR/NOTE-sgml-xml-971215 Comparison of SGML and XML; World Wide Web Consortium Note, 15 December 1997]</ref> Processing instructions are exposed in the [[Document Object Model]] as <code>Node.PROCESSING_INSTRUCTION_NODE</code>, and they can be used in [[XPath]] and [[XQuery]] with the 'processing-instruction()' command.

Processing Instruction: Difference between revisions