ISSUE-27: targetNamespace and Chameleon schemas

ISSUE-27: targetNamespace and Chameleon schemas

http://www.w3.org/2005/06/tracker/databinding/issues/27

Raised by: Paul Downey
On product: Basic

schemas without a targetNamespace, sometimes called "chameleon schemas" as they
take on the namespace of a schema which includes them, are know to cause
difficulties with some existing toolkits. 

Proposal:
The Basic patterns should cite only patterns for the xs:schema element which
include a targetNamespace being declared:

<xs:schema targetNamespace="{xs:anyURI}" ...>