Processing instructions
It is sometimes necessary for an XML document to contain instructions aimed at a particular software application, or at any application that needs to perform a specific process on the document. A processing instruction contains document-specific information, and is bounded by the characters '<?' and '?>':
<? ..... ?>
SGML Note
the '?' at the end is required.
The content begins with a keyword, significant to an application that will understand the instruction. This is followed by a space, then the instruction itself. The instruction may include any valid XML characters:
<?keyword instruction?>
The syntax used for the instruction is assumed to be significant only to the target application. In the example below, a Paragraph ...
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