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A current trend in the design of modern interactive systems is to let people create new value by integrating heterogeneous resources to fit their contextual needs. In this paper, we briefly illustrate our approach for the lightweight integration of service-based and situational work-spaces, pervasively accessible and sharable through a variety of devices. It is supported by a platform implementing a new composition paradigm. Recent studies with end users, performed as part of formative evaluation, showed the feasibility of this approach to help the work of professional guides of archaeological parks.