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Of course, you would want to coordinate changes to routing, transformation, or orchestration that depend on changes to the service's WSDL. (This is easiest for anything deployed in the same Service Assembly as the service in question.)

Note that if you want to support clients using different versions of a service WSDL, you can use Content-Based Routing and XSLT Transformations to send new requests straight through, but run old requests through an XSLT transformation first.

What options are available for building composite services (or business processes)?

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