This definition requires only the concepts
that describe the domain of the service. However the matchmaking engine needs
to infer the process from its implicit representation.
OWL-S provides a representation of service??™s functional capability. However, some
researchers have pointed out that significant improvement for the QoS model should
be made for a realistic solution to OWL-S users. One current limitation of OWLS
QoS model is that it does not provide a detailed set of classes and properties to
represent QoS metrics. The QoS model needs to be extended to allow a precise
characterization of individual metrics.
Web service modeling ontology (WSMO) (Lausen, Polleres, & Roman, 2005) is
another important work to define semantics for Web services. The WSMO provides a
conceptual framework and a formal language for semantically describing all relevant
aspects of Web services. There are four main elements: (1) ontologies, which provide
the terminology used by other WSMO elements; (2) Web service descriptions,
which describe the functional and behavioral aspects of a Web service; (3) goals
that represent user desires; and (4) mediators, which aim at the automatic handling
of interoperability problems between different WSMO elements.
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