- From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
- Date: 17 Jun 2003 17:07:37 +0100
- To: Nigel Hardy <nwh@aber.ac.uk>
- Cc: xmlschema-dev@w3.org
Nigel Hardy <nwh@aber.ac.uk> writes: > The listing below sets the (simplified) scene. An element "List" > contains and number of As and Bs. I'm happy with that schema. > > > I then want to create an alternative schema with an additional > identity constraint, viz. a keyref to ensure that all As reference a > valid B. For the obvious s/w engineering reasons I would like the > alternative schema to be based on the original (not copied) so I feel > I should be using redefine. I can't make this work, feel I am swimming > against a stream and therefore assume that I have got it all wrong > somewhere. Can I use redefine to add identity constraints? Should I be > going about this some other way? You should be able to, but in fact because keys and keyrefs are part of element declarations, not type definitions, you can't. Arguably a design flaw, sorry. ht -- Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh Half-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]
Received on Tuesday, 17 June 2003 12:07:38 UTC