Version Identification (Orchard, Riley)
How can consumers be made aware of service contract version information?
When an already-published service contract is changed, unaware consumers will miss the opportunity to leverage the change or may be negatively impacted by the change.
Versioning information pertaining to compatible and incompatible changes can be expressed as part of the service contract, both for communication and enforcement purposes.
With Web service contracts, version numbers can be incorporated into namespace values and as annotations.
This pattern may require that version information be expressed with a proprietary vocabulary that needs to be understood by consumer designers in advance.
PrinciplesStandardized Service Contract
Because the service contracts express versioning information, Consumer A can proceed to invoke version 3 of the service contract because it was designed to be compatible with that specific version.