Purpose

A shelf used to store compiled XML DTDs as items. These items are created and used as follows:

• Compiling an xml-dtds item (document with creating) sets an item of the shelf to be the compiled DTD. It creates the item if it did not previously exist.
• Parsing an instance or instance part (instance or element-content) 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.

You can perform the following on the xml-dtds shelf:

• Items can be accessed using their key {...}, but not their item indexer [...]. An xml-dtds item can only be used in a do xml-parse action.
• Items cannot be removed from the shelf using remove.
• clear xml-dtds permanently removes all compiled DTDs from the shelf.

The action new can't be applied to the xml-dtds shelf. The creating option of do xml-parse adds items to the xml-dtds shelf.

None of the other shelf modification actions are allowed with the xml-dtds shelf. You cannot use the following keywords with these shelves:

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

xml-dtds can be thought of as a shelf, except that item values can't be created or used except by do xml-parse (for example, you can't output a compiled DTD).

Related Syntax    creating    document-end    document-start    remove    do xml-parse

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