Where a Semantic Contract Fits…

I’ve been posting about the rise of the informal semantic contract relating to web-services and the deficiencies of XML Schema in adequately communicating the capability of anything other than a trivial service. Formalising a semantic contract by enriching a baseline structural contact (WSDL/XSD) with semantic or content-based constraints, effectively creates a smaller window of well-formedness, through which a consumer must navigate the well-formedness of their payload in issuing a request. Other factors such as incremental implementation of a complex business service ‘behind’ the generalised service interface compound the need for a semantic contract.

To clarify the relationship between structural and semantic, I happened upon a great picture which I’ve annotated…

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