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Re: SimpleType as valid derivation of abstract type in 1.1 ?

From: Guillaume Lebleu <gl@brixlogic.com>
Date: Thu, 08 Mar 2007 22:17:32 -0500
Message-ID: <45F0D1CC.9040100@brixlogic.com>
To: noah_mendelsohn@us.ibm.com
CC: xmlschema-dev@w3.org


I had already tried your suggestion. With:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
   <xs:complexType name="ObjId" abstract="true"/>
    <xs:complexType name="CarId">
            <xs:extension base="ObjId"/>

First, as you can see, the actual type of CarId is not defined.

IBM SQC says:
Description: SEVERITY: 1 ERROR TYPE: 1 When <simpleContent> is used and 
the type is derived by extension, the content type of the basetype must 
be a simple type. empty content model is the  content type of the 
basetype, ObjId. It does not correspond to a simple type.

SaxonSA says:
Description: The type DebitId has simple content so it cannot be derived 
by extension from the type ObjId which has complex content


noah_mendelsohn@us.ibm.com wrote:
> I haven't thought through your example in great detail, but my intuition 
> is that it can be handled by deriving not simple types, but complex types 
> with simple content.  Complex types with simple content are usually used 
> in cases where you want an element like this:
>         <e a="1">234</e>
> where the element is complex (because it has attributes) but has content 
> (in this case the 234) of simple type (perhaps xs:integer).  So, if what 
> you're after is:
>         <car refid="xxxx">corvette</car>
> then that's what you'd want.   In fact, even if what you want is 
>         <car>corvette</car>
> which has no attributes, you can derive a complex type with simple content 
> (perhaps string in this case), that just happens to have no attributes. 
> Noah
> --------------------------------------
> Noah Mendelsohn 
> IBM Corporation
> One Rogers Street
> Cambridge, MA 02142
> 1-617-693-4036
> --------------------------------------
Received on Friday, 9 March 2007 03:17:43 UTC

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