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* Don Kackman | | I've got two document types with associated DTDs. The first is a subset | of the second. I don't want to merge these two DTDs into one file but | also don't want to maintain both files seperately. | | Is it possible to include one DTD in another through an external entity | reference? If so how? In file sub-dtd.dtd: [...lots of declarations...] <!ENTITY % base-dtd SYSTEM "base-dtd.dtd"> %base-dtd; where the file base-dtd.dtd contains the declarations common to both DTDs. You will probably have some problems with content models when you try this if sub-dtd.dtd contains element declarations. If so, it may be helpful for you to know that section 4.2 of the spec says: "If the same entity is declared more than once, the first declaration encountered is binding; at user option, an XML processor may issue a warning if entities are declared multiple times." This can be used to make 'hooks' in content models where sub-DTDs can insert the new elements they introduce. | Also if so, can I declare additional attributes in the second DTD | for elements originally declared in the first? Yes, the XML spec explicitly provides for this. In section 3.3 it says: "When more than one AttlistDecl is provided for a given element type, the contents of all those provided are merged." --Lars M. 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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