Re: [xml-dev] XML Schema Question

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

"Bullard, Claude L (Len)" <clbullar@ingr.com> writes:

> We are assuming that the W3C validator at
> http://www.w3.org/2001/03/webdata/xsv
> is the gold standard (not quite but really the reference implementation):

Thanks for your endorsement, but XSV is not the gold standard -- as
the status page [1] makes clear, there are implementation gaps and
known bugs, to say nothing of unknown bugs.

> Using that implementation, I get the following:

[errors]

> So, http://www.w3.org/TR/xmlschema-1/#normative-schemaSchema

<snip/>

> so this
>
> 	<xsd:choice minOccurs="0">
> 		<xsd:element ref="AudioClip"/>
> 		<xsd:element ref="MovieTexture"/>
> 		<xsd:element ref="ProtoInstance"/>
> 	</xsd:choice>
>
> and this
>
> 	<xsd:choice minOccurs="0" maxOccurs="6">
> 		<xsd:element ref="ImageTexture"/>
> 		<xsd:element ref="MovieTexture"/>
> 		<xsd:element ref="MultiTexture"/>
> 		<xsd:element ref="PixelTexture"/>
> 		<xsd:element ref="ProtoInstance"/>
> 	</xsd:choice>
>
> are invalid, yes?

There are invalid _as named group definitions_.  With named groups, we
had a choice:

 1) Allow min/max both on the reference and the definition;
 2) Allow min/max both only on the reference;
 3) Allow min/max both only on the definition.

We chose (2).  Sorry for the confusion.

ht

[1] http://www.ltg.ed.ac.uk/~ht/xsv-status.html
-- 
  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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