[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Namespace URI address resources
From: Andrew Layman <andrewl@m...> >If we follow the principle of cleanly separating data from its processing, >we want firm ties to the definition of data, and loose ties to its >processing. A schema is "processing" not "data": it is tied to whatever applications understand the schema format. Editing, creating and validating against a schema are all applications. There is no schema language yet that can express all useful constraints. To propose a mechanism that does not allow a plurality of schemas is, in fact, to say that the schema language should defines the (bounds of the) possible schemas: if XML-Data does not support a constraint, it cannot be part of schemas. This is putting the cart before the horse. It is not that the namespace URI identifies a schema that it is the problem, it is : * the notion that a document has only *one* schema and * there is no mechanism yet to allow alternative schemas to be assigned. If W3C made a mechanism to allow alternative schemas (like Jonathon Bordon's recent post), then the namespace URI could be overloaded to provide a schema, as a defaulting behaviour in the absense of a PI. But it is bad for the WWW if there is no mechanism to allow alternatives; without such a mechanism, requiring overloaded use of the namespace URL is bad. Rick Jelliffe 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/ and on CD-ROM/ISBN 981-02-3594-1 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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