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Re: [xsl] Issues with xs:error in the XPath 3.0 and XDM 3.0 Recommendations.


Subject: Re: [xsl] Issues with xs:error in the XPath 3.0 and XDM 3.0 Recommendations.
From: Dimitre Novatchev <dnovatchev@xxxxxxxxx>
Date: Sat, 19 Apr 2014 20:29:42 -0700

 Thank you for these examples.

On Sat, Apr 19, 2014 at 7:38 PM, Graydon <graydon@xxxxxxxxx> wrote:
> On Sat, Apr 19, 2014 at 06:42:01PM -0700, Dimitre Novatchev scripsit:
>> To put it in other words:  Why was the xs:error type introduced (in
>> XML Schema)? What purpose does it serve? What problems does it solve?
>
> http://lists.w3.org/Archives/Public/xmlschema-dev/2009Jul/0045.html (and
> the rest of the thread) may be of interest.
>
> xs:error would appear to be a result of conditional type assignment and
> to allow
>
> <element name="element" type="element">
>      <alternative test="@name" type="localElement"/>
>      <alternative test="@ref" type="elementRef"/>
>      <alternative type="error"/>
> </element>
>
> as a way to define the schema "element" element, so that it must have a
> name or a ref.  This is not something XSD 1.0 would allow.
>
> There's also a case where you're using subset V of large shared
> vocabulary P, and want to forbid element E in V when it is optional in P;
>
> <override schemaLocation="main.path.to.V">
>      <element name="E" type="error"/>
>      <!--* other elements can be excluded here by the same method ... *-->
> </override>
>
> That thread also has the cheerful acknowledgement that anything you can
> do in XSD 1.1 with xs:error you can also do with assertions, but
> xs:error is preferred for style and legibility.
>
> -- Graydon
>



-- 
Cheers,
Dimitre Novatchev
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