- From: <bugzilla@wiggum.w3.org>
- Date: Thu, 06 Sep 2007 22:09:01 +0000
- To: public-sml@w3.org
- CC:
http://www.w3.org/Bugs/Public/show_bug.cgi?id=5024 ------- Comment #1 from pratul.dublish@microsoft.com 2007-09-06 22:09 ------- It is incorrect to assume that the key and keyref in this example will always select from the same set of elements and therefore the keyref constraint is always satisfied. The keyref in this example models the constraints that all students who are enrolled in courses offered by a university are also enrolled in the university. Here's a simple instance that violates this constraint: University U has students S1, S2, ..., S1000 U offers courses C1, C2,..., C50 Students enrolled in C1 are S1, S2, S1001, S1002 (the last two are not enrolled in U)
Received on Thursday, 6 September 2007 22:09:16 UTC