DTD Question - PCDATA followed by an optional element

[Richard Tobin]

> 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

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev at ic.ac.uk
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1
To unsubscribe, mailto:majordomo at ic.ac.uk the following message;
unsubscribe xml-dev
To subscribe to the digests, mailto:majordomo at ic.ac.uk the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa at ic.ac.uk)