XML Schema Generation from Data and Message Contracts

Hi,

The GeneratedXmlSchemas method in the WsdlExporter class is quite handy, if
I want to generate an XML Schema for Message and Data contracts that are used
in a Service.

Unfortunately (and understandably) it only reflects over the CLR types which
are actually part of an Operation Contract.

Does anybody know how I can generate an XML Schema from a Message or Data
Cotnract class without defining them in the service?

So, ideally I would like to do something like this:

XmlSchema xsd = ???Exporter???.GenerateXmlSchema(typeof(MyMessageContract));

Thanks for your help =)
patric