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Well defined business processes are a crucial success factor for deploying SOA/SOKU architectures. In this paper, the declarative business process description language -ROsWeL -which supports applications compatible with ROA, is discussed. ROsWeL provides a declarative, reliable and semi-automatic composition of RESTful web services, enriched by the knowledge representation. The paper discusses benefits of ROsWeL, and presents an example of a simple workflow that captures essential ROsWeL features.

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Abstract. SOA is a popular paradigm for building distributed systems that has gained a great recognition over past years. There are two main approaches to implementing SOA: SOAP-based and RESTful Web services. In order to address problems of modeling and verification of Web services, several process calculi have been proposed for SOAP-based Web services but none for the RESTful Web services based systems. This article is a comparative survey on existing process calculi for SOA systems, also the existing attempts to formalize REST systems are discussed. The aim of the article is to see how process calculi for SOAP-based systems deal with different aspects of their modeling domain, and whether their approaches can be used to model RESTful and ROA systems. Finally, basing on the survey, requirements for a new process calculus specific for REST are defined.