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- From: firstname.lastname@example.org (Henry S. Thompson)
- To: email@example.com
- Date: 09 Feb 1998 12:45:01 +0000
"Don Park" <firstname.lastname@example.org> 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
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">
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.
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: email@example.com
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