As a somewhat irrelevant aside, I find the OGC (Open Geospatial Consortium) specification of as Web Feature Service as helpful in suggesting a general structure of a data service. Donal K. Fellows wrote:
guru prasad wrote:
I have the following opinion about the proposed definition for a data service: "A service that exposes the capabilities or data of one or more data resources within a service-oriented architecture."
I'm trying to understand why there should be a distinction between "capabilities" and "data" in this context. Data's interesting for what you can do with it. :-)
The definition just tells me that Data Service just exposes the capabilities and/or data of data resource(s). But, it does not tell me if I can access this service to invoke those capabilities or the data of a data resource.
It's exposing the capabilities, not (necessarily) a description of them.
If this is true, then, 'service' is too strong a term. It should be 'data resource descriptor'. Else, 'service that exposese the capabilities or data' has to be rephrased. Because it is not only exposing but also allowing the user to access those capabilities.
A capability isn't exposed if it isn't (at least in principle) accessible.
Donal.
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