[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Entities in XSchema
Paul Prescod wrote: > SAX provides information on ID/IDREF attributes, but I don't think that > ESIS did, so this is more debatable. But not all SAX-compliant parsers do: attribute type checking is a validity constraint only, so non-validating parsers are free to return CDATA as the type of all attributes. As one who is fairly SGML-ignorant, I would like to know: Just what is in the ESIS? (If you will, limit the answer to things XML also has.) > Anyhow, I wouldn't care much if we cut loose all of those types. I just > don't think that removing them is the natural extension of not checking > text entities. I was attempting to adopt the distinction between "what IS so" and "what MUST BE so" (which DTDs conflate) and see where it led. Content models say what must be so, and entity declarations say what is so, that much is clear. Attribute declarations are a mixture. > We might not need fixed attributes. A fixed attribute is merely an > attribute with a single choice. Can't that be represented directly as a > choice attribute with a single choice (yes, this implies that we would > open up "choice" attributes beyond names...any arguments with that?) > > So that would allow us to reduce the "optionality" requirement to > "optional or required". Okay, that leads to a model with the following (meta-)attributes of attributes: name CDATA #REQUIRED syntax (name | nmtoken | names | nmtokens | general) #IMPLIED choices CDATA #IMPLIED -- a list of choices or "free" if none -- optionality: (optional | required) "optional" -- John Cowan http://www.ccil.org/~cowan cowan@c... You tollerday donsk? N. You tolkatiff scowegian? Nn. You spigotty anglease? Nnn. You phonio saxo? Nnnn. Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5) 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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