Service Oriented Opportunistic Sensor Networks (TOppS) project at the Swedish Defense Research Agency aims to offer user numbers of services from sensor networks. As non- technicians, end-user of TOppS would require a user-friendly GUI with the ability of manipulating the gathered web services to create new service which can meet their own demands. In this work, we designed and implemented a Web-based graphical workspace prototype called Service Composition Workspace (SCW) using Semantic Web technologies such as includes Web Ontology Language (OWL), Ontology Web Language for...