Re: Inheritance in XML (was Re: Problems parsing XML)
Martin Bryan wrote: > > > In SGML you can use exclusions to make an element a true subclass of > another: > > <!ELEMENT X (%Y-contents;) -(a|b|c)> > > providing a, b and c are optional components within the model for Y. Element X is not a true subclass or subtype. Given a content model: <!ELEMENT J (Y)> You cannot use an X. What you've done above is make an element whose content model is more restrictive than some other content model. You can also do that without exclusions. I don't think I've ever used exclusions in that way. One big problem is that the exclusion doesn't just change the content model, but the content model of all of X's children. You don't want that if all you need is content model subsetting. Paul Prescod - http://itrc.uwaterloo.ca/~papresco "Journalism is good if you follow the rules. Don't allow the human rights groups to spoil your profession" - Col. Godwin Ugbo of the Nigerian military dictatorship 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/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe 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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