WS-I Basic Profile compliant schema import

it appears that the only way to import a schema and be 
able to reference the elements from a WSDL message 
and remain Basic Profile compliant is as follows:

"""
  <wsdl:types>
        <xs:schema>
          <xs:import
             namespace="http://example.com/schema"
             schemaLocation="schema.xsd"/>
        </xs:schema>
  </wsdl:types>
"""

That is, you have to use a chameleon schema which the 
Basic Patterns document preculudes due to known interoper
issues with tools.

Is this constrained pattern well enough supported by tools 
to be included in the "Basic" document?

Paul