- From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
- Date: 24 Oct 2000 18:53:16 +0100
- To: paul@pnlassociates.com
- Cc: "Linda M. Phillips" <linda@pnlassociates.com>, xmlschema-dev@w3.org
"Paul B. Anderson" <paul@pnlassociates.com> writes:
> Henry,
>
> Thanks for your prompt reply. If I understand correctly, <all> allows the
> child elements to appear or not appear, and in any order. It also seems to
> allow the case of none of the elements. If so, this does not accomplish our
> goal of A inclusive-or B since at least one is not guaranteed to appear.
Right, sorry.
The best you can do is the same as with DTDs:
(ab?|ba?) ==
<choice>
<sequence>
<element ref="a"/>
<element ref="b" minOccurs="0"/>
</sequence>
<sequence>
<element ref="b"/>
<element ref="a" minOccurs="0"/>
</sequence>
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, 24 October 2000 13:53:25 UTC