W3C home > Mailing lists > Public > xmlschema-dev@w3.org > February 2007

Re: Abstract types in substitution groups

From: Pete Cordell <pete@tech-know-ware.com>
Date: Thu, 8 Feb 2007 13:51:48 -0000
Message-ID: <002401c74b88$482f18b0$eb00a8c0@Codalogic>
To: "C. M. Sperberg-McQueen" <cmsmcq@acm.org>
Cc: "Michael Kay" <mike@saxonica.com>, <xmlschema-dev@w3.org>

Ah - Got it.  Many thanks.

Pete.

Original Message From: "C. M. Sperberg-McQueen"
> On 8 Feb 2007, at 05:38 , Pete Cordell wrote:

>> So does the abstractness of the type become a property of the  
>> element?  i.e.
>>
>> <xs:element name='myElement' type='abstractType'/>
>>
>> is equivalent to:
>>
>>
>> <xs:element name='myElement' type='abstractType' abstract='true'/>
>> ?
>
.... 
>  Neither
> allows an element instance like
> 
>   <myElement>...</myElement>
> 
> but  if the schema defines 'concreteType' as a concrete type derived
> from abstractType, then the first declaration allows
> 
>   <myElement xsi:type="concreteType">...</myElement>
> 
> to appear in the document -- it is the type which is abstract, not
> the element.  The second declaration, by contrast, does not allow
> such an element instance.
--
=============================================
Pete Cordell
Tech-Know-Ware Ltd
for XML to C++ data binding visit
http://www.tech-know-ware.com/lmx
(or http://www.xml2cpp.com)
=============================================
Received on Thursday, 8 February 2007 14:13:42 UTC

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