A Web Service is a service that can be accessed over a network using XML based messages communicated through Internet protocols. The Web Service Description Language (WSDL) enables description of the operations supported by a Web Service, the location of a Web Service, and methods for accessing a Web Service in XML. WSDL (Web Service Offerings Language) is a novel XML-based language, compatible with WSDL 1.1, for formal specification of constraints, management statements, multiple classes of service for Web Services and contracts between Web Services. Explicit and precise specification of such information is essential for management of Web Services and Web Service compositions. The focus of this thesis is on the development of XML grammar and parser for WSOL. The WSDL grammar is developed using the XML Schema language. The WSDL grammar enables generation of WSDL documents that conform to the grammar. A WSDL parser named "Premier" is developed in Java, based on the Apache Xerces2 Java XML parser. The WSDL parser enables validation of WSDL and WSDL-related documents and detection and notification of various syntax and semantic errors in them. An illustrative WSDL example is also developed that enables verification of the developed WSOL grammar and the WSDL parser.
展开▼
