Processing Instructions (PIs)

Processing instructions are used to embed information intended for proprietary applications. The XML declaration is an example of a processing instruction. Processing instructions beginning with 'xml' or 'XML' have been reserved for standardisation in the XML Version 1.0 specification and onwards.

<?PI-target ?>

where:
Example:
<?xml version='1.0'?>
<?word document="test.doc" ?>
<root>
</root>

Rules:

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