| http://www.w3.org/ns/prov#value | - In Service-Oriented Computing, service client's requirements are commonly expressed in terms of inputs, outputs, pre-conditions and effects, also known as IOPE. End-users, i.e., human service clients, may have difficulties to express such requirements as they would have to deal with technical issues such as the request's language, and the type, format and coding of the IOPE. This paper presents th
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