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

[ht@cogsci.ed.ac.uk (Henry S. Thompson)]

"Tolkin, Steve" <Steve.Tolkin@fmr.com> 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@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/

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