- From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
- Date: 12 Feb 2001 10:12:01 +0000
- To: "Arnold, Curt" <Curt.Arnold@hyprotech.com>
- Cc: "'www-xml-schema-comments@w3.org'" <www-xml-schema-comments@w3.org>
"Arnold, Curt" <Curt.Arnold@hyprotech.com> writes:
> {selector} specifies an XPath expression [XPath] relative to
> instances of the element being declared. This must identify a node
> set of subelements (i.e. elements contained within the declared
> element) to which the constraint applies. Whether an arbitrary
> XPath expression (for example, one that uses the id() function or
> the parent axis) identifies a node set of subelements of the context
> element can't be determined until applied to the document being
> validated. It would be better to constrain selector so that only
> expressions that always return subelements are allowed, such as
> saying that the xpath attribute must be a UnionExpr where any
> AxisSpecifier is restricted to the set (child, descendant, self or
> descendant-or-self, //, .).
We've done essentially this for the next WD.
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 Monday, 12 February 2001 05:12:11 UTC