For an automatic invocation of Web services, concrete platforms allow the client-side generation of stubs by means of suitable primitives of programming languages. In this setting, we propose a framework that preserves static and dynamic integrity constraints of invocation parameters. The main ingredients of the framework are: (ⅰ) WSDL, a Web services description language that describes the interface, the semantics and the protocol for invoking Web services, (ⅱ) CLiX, a language for constraints specification in XML that allows the specification of static and dynamic integrity constraints of Web service parameters by means of logic formulas; (ⅲ) reflection mechanisms for managing complex user-defined types. The proposed framework is entirely based on XML-based technologies and allows only provably correct Web services invocations be forwarded by client-side checking CLiX formulas.
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