Purpose

sgml-dtds is a built-in shelf used to store compiled SGML DTDs. These items are created and used as follows:

• Compiling a DTD (using creating with either document or subdocument) assigns an item of the shelf to be the compiled DTD. If the item did not previously exist, it is created.
• Parsing an instance or partial instance (instance or with document-element) uses an item of the sgml-dtds shelf. An item of this shelf can be used any number of times. Items can even be used simultaneously for nested do sgml-parse actions.

The following operations can be performed on sgml-dtds.

• Items can be accessed by key, but not by item.
• sgml-dtds shelf items can only be used in the header of a do sgml-parse block.
• clear sgml-dtds can be used to remove all DTDs from the sgml-dtds shelf.

The only way of adding items to the sgml-dtds shelf is with the creating option of do sgml-parse.

No other shelf-modifying actions are allowed with the sgml-dtds shelf. Specifically, the following operations cannot be used with sgml-dtds:

• item of
• key of
• lastmost
• new
• number of
• remove
• repeat over
• using

Related Syntax creating do sgml-parse xml-dtds

Related Concepts SGML DTDs: creating

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