document: Capturing the essentials of federated systems Today , the Web is increasingly used as a platform for distributed services , which transcend organizational boundaries to form federated applications . Consequently , there is a growing interest in the architectural aspect of Web-based systems , i.e. the composition of the overall solution into individual Web applications and Web services from different parties . The design and evolution of federated systems calls for models that give an overview of the structural as well as trust-specific composition and reflect the technical details of the various accesses . We introduce the WebComposition Architecture Model ( WAM ) as an overall modeling approach tailored to aspects of highly distributed systems with federation as an integral factor .
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