Purpose

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

• Compiling a DTD (using creating with document) 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 xml-dtds shelf. An item of this shelf can be used any number of times. Items can even be used simultaneously for nested do xml-parse actions.

The following operations can be performed on xml-dtds.

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

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

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

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

Related Syntax creating do xml-parse sgml-dtds

Related Concepts XML DTDs: creating

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