Modeling Service Contracts Composition, Management and Visualization with tree graphs: Ma.Vi.C.

The paper presents Ma.Vi.C, a tool to visualize and manage contracts, and in particular Service Level Agreements (SLAs), in Service-oriented Architecture (SOA), in order to manage and visualize their composition in IT services chains scenarios. The model is also oriented to Service Networks, seen as a combination of participants, relations between them, service requests and offerings [1]. Services contracts and SLAs definition suffer from a lack of templates or standards that would allow providers accurately identifying elements to be inserted into the contract, and defining the correct form to express service specifications, obligations and so on. These aspects have a direct impact in the case of composition of services, because services choreography involves both functional and service levels aspects. We propose a framework, Ma.Vi.C, for designing and visualizing the composition of service contracts and to simplify contracts data handling. The framework is based on a set of model for modeling service contracts, topologies and rules, which are based on tree graph and XML.