H.Foster, L.Gonczy, N.Koch, P.Mayer, C.Montangero, and D.Varr, UML Extensions for Service-Oriented Systems to appear in Rigorous Software Engineering for Service-Oriented Systems - Results of the SENSORIA project on Software Engineering for Service-Oriented Computing, M.Wirsing and M.Hölzl (Eds.), Springer-Verlag Berlin and Heidelberg GmbH & Co. (2010).