Re: XML Schema for XTM DTD

At 00:09 07.02.2003 +0100, Lars Marius Garshol wrote:
> the next XTM syntax specification should include an informative XSDL
> schema.
> ...
> As far as I can see, both schemas should constrain the XTM syntax as
> it will be as tightly as possible, but do nothing beyond that. The
> syntax itself should remain the same, and the DTD should continue
> being the normative specification of the syntax, together with the
> prose.
>
> Comments? Opinions?

I agree that we should provide informative (but nevertheless standard)
alternative schemas, but we should also add two issues to be dealt with
at the next SC34 meeting (if anyone on this list has opinions on them,
please make them known before the May meeting):

(1) Should the DTD or the RELAX-NG schema be the normative version?

(2) To the extent that DTDs do not formally support all the constraints
    required by XTM, should the XSD and RELAX-NG versions state those
    constraints formally?
    Some examples:
     - the value of an xlink:href attribute must be a URI
     - <topicRef> elements must reference <topic> elements

Steve

--
Steve Pepper, Chief Executive Officer 
<pepper-76mms6M3oqTR7s880joybQ@xxxxxxxxxxxxxxxx>
Convenor, ISO/IEC JTC1/SC34/WG3  Editor, XTM (XML Topic Maps)
Ontopia AS, Waldemar Thranes gt. 98, N-0175 Oslo, Norway.
http://www.ontopia.net/ phone: +47-23233080 GSM: +47-90827246