Processing Instructions
March 29, 1999
We have already seen a processing instruction. The XML
declaration is a processing instruction. And if you recall,
when we introduced the
XML declaration we promised to return
to the concept of processing instructions to explain them as
a category.
So here we are.
A processing instruction is a bit of information meant for the
application using the XML document. That is, they are not
really of interest to the XML parser. Instead, the instructions
are passed intact, straight to the application using the parser.
The application can then pass this on to another application
or interpret it itself.
All processing instructions follow the generic format of:
<?NAME_OF_APPLICATION_INSTRUCTION_IS_FOR INSTRUCTIONS?>
As you might imagine, you cannot use any combination of "xml"
as the NAME_OF_APPLICATION_INSTRUCTION_IS_FOR
since "xml" is reserved. However, you might have something like:
<?JAVA_OBJECT JAR_FILE = "/java/myjar.jar"?>
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