[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Question on ANY (its use in RDF)
[Marcus Carr] > Roger L. Costello wrote: > > I have a question about the ANY type. It is my understanding that > > an element defined to be of type ANY can contain any element that > > is defined *within* the DTD (i.e., it cannot use elements that are > > not defined in the DTD). Correct? Correct. > My advice to anyone is never accept a DTD that uses ANY. The only > legimate use I have ever seen for it is in an interim DTD during > data conversion. It's a sloppy use of a sloppy mechanism - for > example, would you really want to support an infinite number of > nested rdf:Description elements? There is no preventing this - even > the DOCTYPE element can be nested within itself. However, remember that a document type is composed of its formal specification *and* its prose specification. Moreover, RDF is explicitly intended for use with namespaces. The RDF DTD expresses constraints among RDF elements; using ANY in the content model of its root was a good idea, just like HyTime uses ANY for most of its content models. Though I don't think the spec explicitly says so, RDF is more akin to an architecture than to a document type, but without the ability to rename element types. -Chris -- <!NOTATION SGML.Geek PUBLIC "-//Anonymous//NOTATION SGML Geek//EN"> <!ENTITY crism PUBLIC "-//O'Reilly//NONSGML Christopher R. Maden//EN" "<URL>http://www.oreilly.com/people/staff/crism/ <TEL>+1.617.499.7487 <USMAIL>90 Sherman Street, Cambridge, MA 02140 USA" NDATA SGML.Geek> 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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