Abstract
REpresentational State Transfer (REST) is the set of design principles behind the World Wide Web (WWW). REST treats all entities in the world as link-connected resources, and supports a resource-oriented architecture (ROA) for the design of applications. REST and ROA are responsible for many of the desirable quality attributes achieved in the WWW, such as loose-coupling (better adaptability) and interoperability. However, many exiting Web-based or service-oriented applications (WSDL/SOAP-based) only use WWW/HTTP as a tunneling protocol or abuse URL and POX (Plain Old XML) by encoding method semantics in them. These applications use fine-grained remote procedure calls (RPC), breaking REST/ROA principles. We observe two kinds of challenges: 1) conceptually modelling process-intensive applications using a ROA promoted by the REST principles; and 2) practically decomposing a workflow-based business process into distributed, dynamic and RESTful process fragments. In this paper, we propose a ROA for business processes following the RESTful principles. We evaluate our approach by comparing it with current SOAP/WSDL/BPEL-driven approaches in terms of feasibility, process visibility, interoperability, and adaptability.
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