Namespaces, Architectural Forms, and Sub-Documents
It seems to me that when you want to embed large contiguous structures from different document types in an XML document, each different namespace should be its own sub-document, referenced as a binary entity (or using whatever other mechanisms are available in XML-Link). Good tools and protocols should make it possible to create, transmit, and process compound documents as if they were single files. This will be necessary anyway for supporting multimedia. Here are some general guidelines: * Architectural forms are most suitable for applications where multiple inheritance is required, or where elements belonging to a different document type are scattered throughout a document. * Sub-documents are most suitable for applications where all of the element belonging to a different document type are rooted in a single subtree. "namespace:gi" element type names are unsuitable for several reasons: 1) The complexity of namespaces is exposed to the author rather than hidden in the DTD (as it is, optionally, with architectural forms). 2) Multiple inheritance is not possible (X can be a kind of Y or a kind of Z, but not both). 3) Standard DTD-based validation is not possible, and it is more difficult to create DTD-driven authoring tools. 4) Both architectural forms and sub-documents can be fully supported under the existing spec by _both_ validating and non-validating XML parsers: no changes necessary. Furthermore, they will also remain compatible with SGML tools. Why are people worried about writing specs to solve a problem that already has good, working, available solutions? All the best, David -- David Megginson ak117@f... Microstar Software Ltd. dmeggins@m... http://home.sprynet.com/sprynet/dmeggins/ 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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