RE: ATTLIST question
James Gray wrote: > I'm trying to create a DTD that will incorporate an > attribute list that will allow the following case: > > 1. Define optional values for an element > 2. Require one of the options be present > 3. Not allow any option other than those listed > > I've scoured my XML books and can't figure out how > to implement such a case. An example that is > similar is for shirts. I'd like to have a "shirt" > element that is only allowed to the values: > S, M, LG, XL > > If the <shirt> element is filled with "XS" or "XXL", > I would be able to reject it based on my DTD? Yes, you would, with a validating parser. A possible DTD fragment to get what you want, using enumerated attribute values and requiring the "size" attribute for shirt elements: <!ELEMENT shirt EMPTY> <!ATTLIST shirt size (S|M|LG|XL) #REQUIRED> Tim Bray says of enumerated attribute values: "You'll see a lot of this in real-world XML documents"  Hope it helps. Steve Rowe MNIS-TextWise Labs  The Annotated XML Specification <URL:http://www.xml.com/axml/testaxml.htm> In Section 3.3.1 (Attribute Types), at the (T)echnical note to the Enumeration validity constraint: <URL:http://www.xml.com/axml/notes/EnumAttr.html>
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