DTD Question - PCDATA followed by an optional element
I have a large number of fields that normally hold simple textual data, but might also include a comment. The XML would look like this with no comment: <rho0> 1.0 </rho0> or this, when the comment is present: <rho0> 1.0 <comment> blah, blah </comment> </rho0> I have no problem in the DTD when I leave out the possibility of a comment, I simply use something like this: <!ELEMENT rho0 (#PCDATA)> To include the comment, I would like to be able to simply say: <!ELEMENT comment (#PCDATA)> <!ELEMENT rho0 (#PCDATA, comment?)> That doesn't seem to be acceptable. I also tried: <!ELEMENT rho0 ((#PCDATA) | (#PCDATA, comment))> Is it possible to do what I want? If not, I could consider putting one more level of tags around the data, like this: <rho0> <data> 1.0 </data> <comment> blah, blah </comment> </rho0> But that adds extra bulk, and code, that should not be needed. Any suggestions would be appreciated. Whatever solution I come up with must work with IBM's XML4J parser. - Norm - Norman H. Samuelson nhs@l... Lawrence Livermore National Lab 925-422-0661 P.O. Box 808, L-98 Livermore, CA 94551 xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To unsubscribe, mailto:majordomo@i... the following message; unsubscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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