[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: What Schema should do (was W3C XML Schema Questionaire)

• From: ht@c... (Henry S. Thompson)
• To: "Tolkin, Steve" <Steve.Tolkin@f...>
• Date: 10 Jul 2000 11:20:19 +0100

"Tolkin, Steve" <Steve.Tolkin@f...> writes:

> <snip/>

> IDs:  Address the problem of how to generate ID (and IDREF) values from a
> database.
> The fact that an ID cannot be "look like" a pure number is a major
> limitation.  I understand that this comes from XML itself, rather than from
> Schema.  I further understand that this limitation is caused by wanting to
> ensure that an XML document is a valid SGML document.  Is it possible to
> loosen up XML on this?  Or is it possible for Schema to provide some help
> for this?  This is related to the issue of wanting a way to have IDs that
> are not unique within the document as a whole, but which are unique within a
> smaller "scope", e.g. for a specific element type, or (perhaps) in a
> specific subtree associated with one input document in a "merged" document.

All this is provided for by the identity constraints of
key/unique/keyref in the existing design [1].

ht

[1] http://www.w3.org/TR/xmlschema-1/#Identity-constraint_Definition
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@c...
		     URL: http://www.ltg.ed.ac.uk/~ht/

***************************************************************************
This is xml-dev, the mailing list for XML developers.
To unsubscribe, mailto:majordomo@x...&BODY=unsubscribe%20xml-dev
List archives are available at http://xml.org/archives/xml-dev/
***************************************************************************

• References:
  • What Schema should do (was W3C XML Schema Questionaire)
    • From: "Tolkin, Steve" <Steve.Tolkin@f...>

• Prev by Date: Re: element order restrictions?
• Next by Date: Re: Mixed contents and group in schema definition
• Previous by thread: What Schema should do (was W3C XML Schema Questionaire)
• Next by thread: DTD parser again
• Index(es):
  • Date
  • Thread