Web service complex request ontology and its answers models

The Web service requests are increasingly complex, the complex request requires many functionalities having any dependencies, binary dependencies or global dependencies. The request can requires also constraints, objectives and conditions. All requested elements having a semantically links which they are defined as an ontology. The ontology can be used as a smart questionnaire to formalize the request, and its semantic is useful to provide automatically the resolution way. Since we can not find an answering service for a complex request, we use the composition of existing Web services to design the answer (s). Then we determinate -according to the request characteristics- the suitable composition model. This paper presents an ontology of complex request and its corresponded answering compositions models.