Re: Extension of xs:simpleContent

Hi,

I believe under XSD 1.0 it is valid but under XSD 1.1 it would not be.  
See http://lists.w3.org/Archives/Public/xmlschema-dev/2009Feb/0040.html 
and the subsequent discussion; I believe it is the same question.

Kevin

On 11/17/2010 12:15 PM, Pete Cordell wrote:
> I have a customer who has a schema that extends a simple type double 
> into a complex type with simple content, and then as a separate 
> construct extends that into a complex type with complex content.  They 
> do this along the following lines:
>
> <xs:complexType name="DoubleBase">
> <xs:simpleContent>
> <xs:extension base="xs:double">
> <xs:attribute name="DoubleBaseAttr" type="xs:boolean"/>
> </xs:extension>
> </xs:simpleContent>
> </xs:complexType>
>
> <xs:complexType name="DoubleBaseExtension">
> <xs:complexContent>
> <xs:extension base="DoubleBase">
> <xs:attribute name="DoubleExtensionAttr" type="xs:boolean"/>
> </xs:extension>
> </xs:complexContent>
> </xs:complexType>
>
> (To avoid confusion, the intent of the latter is to add the 
> DoubleExtensionAttr attribute rather than mandate that you've got 
> complexContent.)
>
> My feeling is this is wrong because DoubleBaseExtension should specify 
> xs:simpleContent rather than xs:complexContent.
>
> However, XML Spy and Visual Studio seem to accept the above, and the 
> example is actually based on a industry consortium schema that 
> specifies similar constructs.
>
> So my questions are:
>
> 1) Is the above schema correct or not?
>
> 2) If it is technically incorrect, is it widely occurring (possibly 
> because tools fail to pick it up) and therefore worth overlooking this 
> error?
>
> Thanks,
>
> Pete Cordell
> Codalogic Ltd
> Interface XML to C++ the easy way using C++ XML
> data binding to convert XSD schemas to C++ classes.
> Visit http://codalogic.com/lmx/ or http://www.xml2cpp.com
> for more info
>
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