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| Related Syntax | Related Concepts | ||||||||
| built-in variable | #appinfo | ||||||||
Purpose
A pre-defined, read-only shelf that provides processing data to an application by accessing the #appinfo parameter of an SGML declaration. It may appear only in a string expression, either in the format item "%g" or as the name of a stream.
Whether the #appinfo shelf has a value depends on the state of SGML parsing. It has a value only if the SGML declaration has already been parsed and it had an #appinfo declaration other than "None". If this is not the case, the stream is unattached.
Therefore, it is never attached in:
document-start rule.
do sgml-parse rule prior to the parse continuation operator (%c or suppress), unless a pre-compiled DTD is used.
do sgml-parse rule after the parse continuation operator (%c or suppress).
document-end rule when errors occurred before this information could be determined.
In addition, use of #appinfo has the following limitations:
#appinfo is "read-only" and may be passed to a function only as a read-only argument, remainder, or value.
#appinfo must not be accessed in process, process-start or process-end rules.
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Related Syntax document-end document-start do sgml-parse suppress |
Related Concepts XML/SGML parsing: built-in shelves |
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