“…Two promising technologies in service orientation are service matching, which facilitates discovery of services on the Web [1,2,3], and service composition, which aims to assemble services into new applications [4,5,6,7,2,8,3]. These technologies, henceforth collectively referred to as service retrieval, promise to help users find and reuse new services, providing an agile and trustworthy environment for executing services and creating new applications.…”