DTD Question - PCDATA followed by an optional element

Richard Tobin richard at cogsci.ed.ac.uk
Wed Nov 17 16:47:41 GMT 1999

> I have a large number of fields that normally hold simple textual data, but 
> might also include a comment.

You can't constrain the content in that way with a DTD.  The best you
do is

    <!ELEMENT rho0 (#PCDATA|comment)*>

which allows any mixture of comments and text.

The only alternative is to change the structure, perhaps as you
suggest by putting the data in another element, or perhaps by
making the comment into an attribute.

-- Richard

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