- From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
- Date: 31 Aug 2000 15:32:40 +0100
- To: Claude Seyrat <cseyrat@acland.fr>
- Cc: www-xml-schema-comments@w3.org
Claude Seyrat <cseyrat@acland.fr> writes:
> I'm in charge of the MPEG-7 schema language group which
> decided recently to rely on XML Schema. MPEG-7 schema
> designers desire clarification about the following validation
> rule (1.1.4) :
>
> "
> In 5.11 Complex Type Definition Constraints :
> ..
> Constraint on Schemas: Derivation Valid (Extension)
> If the {derivation method} is extension:
> 1.1
> If the {base type definition} is a complex type
> definition:
> ...
>
> >>>>>>>>>>>>>> 1.1.4 The {content type} of the complex type itself
> must not be a simple type definition;
> ...
> "
>
> Does it mean that the following schema is not valid ?
>
> <complexType name="t1" base="integer" derivedBy="extension">
> <attribute name="a1" base="integer"/>
> </complexType>
>
> <complexType name="t2" base="t1" derivedBy="extension">
> <attribute name="a2" base="integer"/>
> </complexType>
I _think_ that's a bug, will check further and get back to you.
ht
--
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
W3C Fellow 1999--2001, part-time member of W3C Team
2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
URL: http://www.ltg.ed.ac.uk/~ht/
Received on Thursday, 31 August 2000 10:32:43 UTC