- From: Zafar Abbas <zafara@microsoft.com>
- Date: Tue, 1 Jun 2004 12:01:59 -0700
- To: "Henry S. Thompson" <ht@inf.ed.ac.uk>, "Nigel Hardy" <nwh@aber.ac.uk>
- Cc: <xmlschema-dev@w3.org>
>Basically, the REC (correctly, in my view) imposes _no_
>requirements on keys if there are no hits for a keyref
From my reading of the clause below, it does seem that the content
selected by a key _must_ exist in the content, and if someone wanted to
have null keys, one would use xs:unique.
structures spec section 3.11.1:
{key) the Identity-constraint definition asserts uniqueness as for
unique. key further asserts that all selected content actually has such
tuples.
-Zafar
Received on Tuesday, 1 June 2004 15:03:06 UTC