Re: Extension of xs:simpleContent

Many thanks Kevin.  It's exactly the same question.  A case of it's wrong 
but it's right!

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

----- Original Message ----- 
From: "Kevin Braun" <[email protected]>
To: "Pete Cordell" <[email protected]>
Cc: <[email protected]>
Sent: Wednesday, November 17, 2010 6:27 PM
Subject: 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
>>
>>
>>
>>
>>
>
>