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| built-in variable | sgml-dtds | ||||
Purpose
 sgml-dtds is a built-in shelf used to store compiled SGML DTDs. These items are created and used as
        follows:
        
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. 
          
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 only way of adding items to the sgml-dtds shelf is with the creating option of do
          sgml-parse. No other item-modifying actions are allowed with the sgml-dtds shelf.
    
| Related Syntax | Related Concepts | 
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