- From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
- Date: 12 Sep 2000 21:02:04 +0100
- To: Cedric Thienot <cthienot@acland.fr>
- Cc: www-xml-schema-comments@w3.org
Cedric Thienot <cthienot@acland.fr> writes:
> Dear all,
>
> I'm not very clear with a derivation constraint in the document
> XML Schema Part 1: Structures W3C Working Draft 7 April 2000
>
> You can find 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>
>
> And if it is true, I don't really see why.
I think you're right, there's no reason for this, and at this late
date I can't figure out why it was there. Will be fixed in next PWD.
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 Tuesday, 12 September 2000 16:02:08 UTC