Abstract
The potential to achieve dynamic, scalable and cost-effective marketplaces and eCommerce solutions has driven
recent research efforts towards so-called Semantic Web Services that are enriching Web services with machine-processable
semantics. To this end, the Web Service Modeling Ontology (WSMO) provides the conceptual underpinning and a formal
language for semantically describing all relevant aspects ofWeb services in order to facilitate the automatization of discovering,
combining and invoking electronic services over the Web.
In this paper we describe the overall structure ofWSMOby its four main elements: ontologies, which provide the terminology
used by other WSMOelements,Web services, which provide access to services that, in turn, provide some value in some domain,
goals that represent user desires, and mediators, which deal with interoperability problems between different WSMO elements.
Along with introducing the main elements of WSMO, we provide a logical language for defining formal statements in WSMO
together with some motivating examples from practical use cases which shall demonstrate the benefits of SemanticWeb Services.
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