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Re: errata in general and on 'language' datatype

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: Mon, 14 Jul 2003 21:45:27 +0100
To: Martin Duerst <duerst@w3.org>
Cc: www-xml-schema-comments@w3.org
Message-ID: <f5bn0fgn8go.fsf@erasmus.inf.ed.ac.uk>

Martin Duerst <duerst@w3.org> writes:


> Second, erratum E41 to XML 1.0 second edition
> (http://www.w3.org/XML/xml-V10-2e-errata#E41) adds the
> possibility to have xml:lang="". This is important for
> various scenarios ranging from SOAP to RDF to XML Singatures.
> This is currently not allowed for the 'language' simple type.
> While strictly speaking, this is an unforseeable change,
> I'm wondering how it the current version of XML Schema
> the absence of language is indicated (an absence which
> always was possible even before this erratum to XML 1.0,
> at least at the top of the tree and as far down as the
> first actual xml:lang.

xs:language is a type which can be used in the same way as any other
type, to guarantee the syntax of elements and/or attributes declared
to be of that type.  The _semantics_ of those elements/attributes is
up to applications, not XML Schema.

> Would something like xml:lang="xsi:nil" have done the job?

Not at all -- xsi:nil is an attribute with an impact on
schema-validity assessment, that's all.

Thanks for your other suggestions.

  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/
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Received on Monday, 14 July 2003 16:45:28 UTC

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