THE WSMO APPROACH in Visual Studio .NET

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THE WSMO APPROACH
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entailment of ground atomic formulae. Thus, the extension of WSML-Core to WSML-Flight is a syntactic extension, but also a semantic restriction, since WSML-Flight does not de ne entailment of nonground formulae.
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10.2.2.2. WSML Syntax WSML provides three syntaxes for the description of Semantic Web Services, based on WSMO. WSML has a surface syntax, as well as XML and RDF syntaxes for exchange over the Web. WSML can be seen as a testing ground for using formal methods in the description of Semantic Web Services. In the following we will brie y outline the main features of the WSML surface syntax using an example from the book buying domain. Because of space limitations, we will not discuss the XML and RDF syntaxes. The example consists of a small ontologies which describes books, as well as a small Web Service description which describes the functionality of adding a book to a shopping cart, given the id of the cart and the item to be added, which is an actual operation offered by the Amazon Web Service.
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wsmlVariant_"http:/ /www.wsmo.org/wsml/wsml-syntax/wsml- ight" namespace {_"http:/ /example.org/amazonOntology#", dc _"http:/ /purl.org/dc/elements/1.1/"} ontology_"http:/ /example.org/amazonOntology" concept amazonBook title ofType_string concept cart id ofType (1)_string items ofType amazonBook webService_"http:/ /example.org/amazonService" importsOntology_"http:/ /example.org/amazonOntology" capability sharedVariables { cartId, item} precondition de nedBy cartId memberOf_string and item memberOf amazonBook. postcondition de nedBy forall cart ( cart[id hasValue cartId] memberOf cart implies cart[items hasValue item]).
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The ontology ( amazonOntology ) describes books and shopping carts at Amazon. The description of the Web Service shows how concepts from the ontology are used in the Web Service description. The precondition in the example requires that there is an input of type string (concepts
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SEMANTIC WEB SERVICES APPROACHES AND PERSPECTIVES
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preceded with an underscore _ are built-in datatypes, corresponding to the XML Schema datatypes) and an input of type amazonBook. The postcondition describes that if there is indeed a cart with the particular id, the book will be in the cart. WSML has a so-called conceptual syntax which re ects the conceptual model of WSMO in the modeling of Ontologies, Web services, Goals, and Mediators; in the example, all statements belong to the conceptual syntax, except for the logical expressions under the precondition and the postcondition, respectively. The use of the conceptual syntax of WSML does not depend on the chosen WSML variant, except for a few restrictions on attribute constraints in the conceptual syntax for WSML-Core and WSML-DL, which are a result of the lack of nonmonotonic negation in these variants. Besides the conceptual syntax, WSML has a logical syntax which re ects the underlying formalism of the particular WSML variant; the logical expressions under the keyword de nedBy in the example are part of the logical syntax. The syntax is based on FOPL syntax where the logical connectives are English language words ( and, or, etc.) and with speci c extensions for frame-based modeling inspired by F-Logic (e.g., the keyword memberOf in the example). Each WSML variant de nes restrictions on the logical syntax. For example, nonmonotonic negation ( naf ) may not be used in WSML-Core and WSML-DL, and existential quanti cation ( exists ) may not be used in WSML-Core, WSML-Flight, and WSML-Rule. The separation between conceptual and logical modeling allows for an easy adoption by nonexperts, since the conceptual syntax does not require expert knowledge in logical modeling, whereas complex logical expressions require more familiarity and training with the language. Thus, WSML allows the modeling of different aspects related to Web services on a conceptual level, while still offering the full expressive power of the logic underlying the chosen WSML variant. The conceptual syntax for ontologies has an equivalent in the logical syntax. This correspondence is used to de ne the semantics of the conceptual syntax. The translation between the conceptual and logical syntax is sketched in Table 10.1; we
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