Altova Mailing List Archives>Archive Index >xmlschema-dev Archive Home >Recent entries >Thread Prev - >Thread Next - RE: Occurrence constraints RE: keyref with empty setsTo: "Henry S. Thompson" <ht@---.--.--.-->, "Nigel Hardy" <nwh@----.--.--> Date: 6/1/2004 5:02:00 AM
>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
From ht@i... Wed Jun 2 04:35:45 2004
Retur | ||||||
| Company | Legal | Press | Partners | Careers | Sitemap | Contact Us | Altova Blog | Mobile | Full Site | |||
|
