Zoo.xsd written by andy_davidson@apple.com Demonstrates how types can be extended. This can be a useful technique for managing GEO specific versions. The derived types can use restrictions to remove fields from the base class. We should avoid using complexType restrictions. It creates a more difficult programming model of the application programmers. Note is is possible to define types as being abstract. Ref: http://www.w3.org/TR/xmlschema-0/ Copyright 2010 Apple Inc.. All rights reserved. test simple case. normal containment test un-wrapped array test wrapped array