Towards a Task-Oriented, Policy-Driven Business Requirements Specification for Web Services

Dynamic assembly of complex software is possible through automated composition of web services. Coordination scripts identify and orchestrate a number of services to fulfil a user or business goal. The automated process begins at the business requirement stage, thus there exists a need for expressing high level business requirements, in such a way that is accessible by businesses. Current solutions (such as BPMN and UML) fail to include specifications at the appropriate level of abstraction. Our approach defines a graphical notation to depict a business goal in terms of objectives, which are refined by tasks, where the specifics of each task as well as overarching business constraints are encapsulated in a descriptive way in policies.