RE: [xml-dev] Schema Extension and validation of an instance

> Do I need to redefine the IPDR element itself to be of type 
> 'IPDRTypeExtended'??

Yes. You've defined an extended type, but the element declaration still
refers to the original type. You can create an instance that conforms to the
extended type by giving it an xsi:type attribute.

Michael Kay
http://www.saxonica.com/