Web services and formal methods

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This volume presents papers from WS-FM 2007, the 4th International Workshop on Web Services and Formal Methods, held on September 28-29, 2007, in Brisbane, Australia. Web service technology empowers service providers to package and deliver services through software applications on the Web. Current infrastructures allow providers to describe services in terms of structure, access policy, and behavior, facilitating service location, interaction, and the bundling of simpler services into complex ones. However, innovations are essential to address challenges like managing interactions with stateful and long-running services, handling large numbers of services with multiple interfaces and versions, and ensuring the quality of service delivery. Formal methods are crucial in advancing Web service technology. They aid in defining and understanding the semantics of languages and protocols that support existing infrastructures and identifying missing features. Additionally, formal methods provide a framework for reasoning about service behavior, enabling the discovery of individual services that meet specific goals or the composition of multiple services to achieve collective objectives. Furthermore, formal analysis of security properties and performance is vital in various Web service applications, including e-commerce and e-business.