[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML-Data Questions
"Don Park" <donpark@q...> wrote on 30 Jan (sorry for late reply): > I have some questions about the XML-Data spec which affects implementation: > > 1. How are the schemas referenced from XML documents? Not clear. Given the NON-official status of XML-Data, a PI seems the most likely route for now. > 2. How does one validate XML documents which use XML-Data schema rather than > DTD? One doesn't :-) See previous discussion on this list about validation -- 'valid' is predicate over document instances and doctypes AS SPECIFIED IN THE XML SPECIFICATION. The following extract from my SGML97 paper (cf. http://www.ltg.ed.ac.uk/~ht/B9H.html) is relevant: "In our approach, we envisage a) the schema DTD, a definition of an XML representation of document structure, that is, an old-style DTD for schemata; b) a master XML application, the equivalent of the XML parser, which is capable of processing pairs of XML documents, where the first, a schema, is valid in terms of the schema DTD; the second, an instance, has no old-style DTD, but is both well-formed in the XML sense and meta-valid in terms of the schema expressed by the first. Meta-validity is, of course, [conformance] to the document structure constraints contained in the associated schema, which [itself is valid per] the schema DTD." > 3. Current XML-Data does not allow or rather make it easy for enumerated > attribute values to contain spaces becuase space is used as delimeters. > > Why not use the following structure to define enumerated attribute values? > > <elementType id="Book"> > <attribute name="ageGrp" type="ENUMERATION"> > <value>children</value> > <value>adult</value> > <default>adult</default> > </attribute> > </elementType> Um, the Enumeration declared value for attributes must consist of Nmtokens (production 59 in the Proposed Recommendation) so the issue doesn't arise. Support for enumerated notation values isn't in XML-Data yet (if I remember right) but the same constraint obtains there. Hope this helps. ht -- Henry S. Thompson, Human Communication Research Centre, University of Edinburgh 2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440 Fax: (44) 131 650-4587, e-mail: ht@c... URL: http://www.cogsci.ed.ac.uk/~ht/ 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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