[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Weak DTDs
>W. Eliot Kimber wrote: >> Peter has run head-on into one of the fundamental problems with DTDs as >> currently defined by SGML (and XML): we want them to describe *classes* of >> documents when they actually describe *individual* documents (and are >> incapable of defining classes of documents except in very weak ways). > SGML establishes a one-to-one relationship between markup and DTD. The instance - directly or indirectly - *names* its DTD. However, a given instance can be gainfully parsed w.r.t. many DTDs to achieve different effects - weakening contraints is one of them. To do this involves specifying at parse time - rather that at authoring time - what DTD to use for the parse. <Statement InvititationForTrouble=TRUE"> HyTime allows parsing w.r.t. a meta-DTD via HyTime aware parsers. However, I think there are many occasions when there is nothing "meta" involved. Just a desire to parse w.r.t to an alternative schema. Not a meta-schema - just a different schema. </Statement> Sean Mc Grath sean@d... Digitome Electronic Publishing http://www.digitome.com 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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