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Interfaces of all kinds are subject to change. When we make a change to the operations or data offered by a service contract, this change will have an impact the consumers of the interface. In the world of SOA and service-orientation, attention to interface - or service contract - versioning is paramount because the average service-oriented enterprise ends up establishing many more dependencies on a published technical interface than traditional, silo-based application environments. One change can therefore have a ripple effect by impact numerous service consumers, each of which may have been composing the service for a different purpose. This article explores common service contract versioning challenges and proposes different approaches with an emphasis on helping you achieve "extreme" XML compatibility.