Conception of complex systems involves many stakeholders, where each stakeholder models the target system from a particular viewpoint. However, existent modeling paradigms are "stove-piped", which means the information is difficult to share between models produced by these stakeholders, for several reasons. Semantic integration of different viewpoints is the cornerstone of collaborative modeling, because the rational behind modeling is not only representing abstractions of systems, but also generating executable artifacts. Inconsistencies among different views of a system cannot lead to this purpose. Open exo is an opensource modeling tool dedicated to collaborative modeling. We propose, in this document, an architecture for promoting semantics sharing between models in Openflexo.