OASIS Mailing List ArchivesView the OASIS mailing list archive below
or browse/search using MarkMail.

 


Help: OASIS Mailing Lists Help | MarkMail Help

 


 

   Re: Specifying scope of uniqueness in XML Schemas?

[ Lists Home | Date Index | Thread Index ]
  • From: ht@cogsci.ed.ac.uk (Henry S. Thompson)
  • To: Roger Costello <costello@mitre.org>
  • Date: 03 Jan 2000 17:29:52 +0000

Roger Costello <costello@mitre.org> writes:

> In section 3.7 of the XML Schema spec it talks about the mechanism for
> indicating uniqueness (of elements, attributes, or combinations
> thereof).  It says that you can specify uniqueness within a region, or
> over the entire document:
> 
> "Constraints can be specified to have document-wide scope or to hold
> within the scope of particular elements."
> 
> Can someone explain to me how you indicate the scope of a constraint?  I
> am guessing that it is with the selector element, but I am not sure. 

Sorry this isn't clearer:  The scope is indicated by where the
declaration goes:  if I put a <key> element within an element
declaration for an element named 'foo', then the uniqueness and
ubiquity constraints obtain within each <foo>...</foo> in a document.

The <selector> tells you which elements WITHIN each <foo> must have keys.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
     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/

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@ic.ac.uk
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1
To unsubscribe, mailto:majordomo@ic.ac.uk the following message;
unsubscribe xml-dev
To subscribe to the digests, mailto:majordomo@ic.ac.uk the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa@ic.ac.uk)






 

News | XML in Industry | Calendar | XML Registry
Marketplace | Resources | MyXML.org | Sponsors | Privacy Statement

Copyright 2001 XML.org. This site is hosted by OASIS