Example 11
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Processing instructions (PIs) allow documents to contain instructions for applications.
Well-formed documents
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Processing instructions :
<example>
<?perl lower-to-upper-case ?>
<?web-server add-header = "university" ?>
<text>vscht</text>
</example>
Documents with errors
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Processing instruction must end with ?>:
<example>
<?perl run
_
>
</example>