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


Help: OASIS Mailing Lists Help | MarkMail Help



   Re: locally scoped element decls and namespaces

[ Lists Home | Date Index | Thread Index ]
  • From: ht@cogsci.ed.ac.uk (Henry S. Thompson)
  • To: James.Anderson@mecomnet.de
  • Date: 04 Jan 2000 17:44:24 +0000

james anderson <James.Anderson@mecomnet.de> writes:

> Henry S. Thompson wrote:
> > 
> > [...]
> > 
> > We don't yet have a concrete syntax for indicating an association
> > between "no namespace" and a schema in xsi:schemaLocation.
> Wait. Is this really saying that one is looking for a way to encode the
> specification, that a symbol, so encoded as to denote that it is in no
> namespace, is really to be taken to be identical with another symbol, so
> encoded as to denote that it is in another, definite namespace?
> Isn't this impossible by definition?

I think you've misunderstood my (admittedly obscure) point.  Suppose I
have an XML instance document with no namespace declarations of any
kind governing some or all of the GIs therein.  These GIs are not in
any namespace at all.  The Namespace REC even gives us a way of
EXPLICITLY indicating that names in a certain scope are in no
namespace, namely "xmlns=''".  But I may perfectly well want to
identify a schema to use for schema-validating such an instance
document.  How do I do so?  xsi:schemaLocation uses PAIRS of URIs to
accomplish this, with the first member of each pair being a namespace
URI.  But _ex hypothesi_ the GIs of the elements in question are not
in a namespace, hence there is no namespace URI I can use in
xsi:schemaLocation.  If we stay with the admittedly rather clunky
syntax of xsi:schemaLocation as it stands, I expect we'll nominate
something such as ##noNamespace for this purpose. . .

  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