- From: Mukul Gandhi <gandhi.mukul@gmail.com>
- Date: Wed, 17 Nov 2010 23:20:08 +0530
- To: Pete Cordell <petexmldev@codalogic.com>
- Cc: xmlschema-dev@w3.org
Hi Pete, I believe the schema you've posted is correct (I cross checked with Xerces too). I think for simpleContent instances, schema component complexContent can be used technically as well (since simpleContent is a subset of complexContent). Though I would have designed the schema type "DoubleBaseExtension" specified in your example, to use simpleContent rather than complexContent (as you rightly said too). On Wed, Nov 17, 2010 at 10:45 PM, Pete Cordell <petexmldev@codalogic.com> 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 -- Regards, Mukul Gandhi
Received on Wednesday, 17 November 2010 17:50:58 UTC