[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Loss of effective schema validation by DTDs with today's working drafts
One of the things that has been troubling me with today's schema working draft release is the reduction of the effectiveness of validating a schema with the schema DTD. For example, in the previous draft, an element with an empty content model was represented by <elementType name="emptyElement"> <empty/> </elementType> The <empty> element was defined as having an empty content model, so the following fragment would result in a validation error. <elementType name="emptyElement"> <empty> <elementTypeRef name="otherElement"/> </empty> </elementType> In todays, draft the same thing poorly formed element would be represented by <element name="emptyElement"> <archetype content="empty"> <element name="otherElement"/> </archetype> </element> and would validate. Also, the <datatype> element definition in the schema for datatypes uses the "all" compositor (equivalent the SGML &) which allows each of the different facets to appear once, but in any order. Since the all compositor was not included in XML, the closest a DTD can do is allow any of the elements to appear in any order any number of times. It would seem better for the schema to define a specific order so that the DTD could enforce the number of times a particular facet appears. The changes appear intentional from the previous draft and I'm sure there is reasoning (and probably a huge amount of debate) behind it. However, I really liked the <choice>, <sequence>, <any> and <empty> tags from the previous public draft. 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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