[
Lists Home |
Date Index |
Thread Index
]
"Rick Jelliffe" <ricko@allette.com.au> writes:
> From: "Henry S. Thompson" <ht@cogsci.ed.ac.uk>
>
> > You guys are all forgetting your history! At least one of {a, b, c},
> > in any order, is expressible in DTD, and therefore _a posteriori_ in
> > W3C XML Schema:
> >
> > <!ELEMENT x ((a,((b,c?)|(c,b?))?)|(b,((a,c?)|(c,a?))?)|(c,((a,b?)|(b,a?))?))>
> >
> > It's certainly not elegant, and it gets worse as the number of
> > alternatives goes up, but it's not impossible.
>
> Is that what he was asking for? He said
> "at least one of the following X elements must appear in the XML document"
> not
> "at least one of the following X elements must appear in an element"
His example showed all the ones he cared about as children of the same
parent, so I assumed that's what he meant.
ht
--
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
W3C Fellow 1999--2002, 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/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
|
