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Item 17: Use processing instructions for process-specific content
Intended only for a very particular process, often a purely local one
Describes how a particular process acts on the data in the document
Does not describe or add to the content itself
Instruction is a unit that can be treated in isolation; does not extend across a part of the XML document.
Data does not need to be validated.
Content is not XML-like.
Applies to the entire document