[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] XML Architectural Forms
I don't remember seeing an announcement here (apologies if I'm mistaken), but Eliot Kimber and James Clark have announced on comp.text.sgml a proposed ammendment to ISO 10744 that will make it possible to use Architectural Forms in XML. You can find the text of the ammendment at the following URL: http://www.ornl.gov/sgml/wg8/document/1957.htm Here's Eliot's example of a simple, well-formed XML document that uses the base architecture "isobase": <?XML version="1.0" ?> <?IS10744:arch isobase ?> <mydoc isobase="isogen-document"/> This is very exciting, because if accepted, the ammendment will make it possible to solve the XML namespace problem with an International Standard, instead of forcing the W3C to throw together a consortium standard. Base architectures also provide a simple and elegant solution to multiple inheritance; for example, here's Eliot's example modified to implement _two_ base architectures: <?XML version="1.0" ?> <?IS10744:arch isobase ?> <?IS10744:arch mslbase ?> <mydoc isobase="isogen-document" mslbase="microstar-document"/> The element <mydoc> corresponds to <isogen-document> in the isobase namespace and to <microstar-document> in the mslbase namespace at the same time. Even more interesting is the ability to embed the architectural attributes in a DTD, so that they do not appear in the document instance at all. For example, you can create an external DTD like this: <?IS10744:arch isobase ?> <?IS10744:arch mslbase ?> <!ELEMENT mydoc EMPTY> <!ATTLIST mydoc isobase NMTOKEN #FIXED "isogen-document" mslbase NMTOKEN #FIXED "microstar-document"> Now, every XML document that uses this DTD will implement the two architectures automatically, with no additional markup required: <?XML version="1.0" ?> <!DOCTYPE mydoc SYSTEM "mydoc.dtd"> <mydoc/> Authors won't even have to know that they're using architectural forms. Congratulations are due to Eliot and James for taking the time to start this process. 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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