In order to master the complexity of a system at the design stage, several models have to be defined and combined together. However, when heterogeneous and independent DSLs are used to define these models, there is a need to explicitly compose their semantics. While the composition of static semantics of DSLs is straightforward, the coordination of their execution semantics is still challenging. This issue is generally called inter-DSL collaboration. In this paper, we propose a formal Model Driven Engineering (MDE) framework built on the Meeduse language workbench that we extend with the Business Process Model and Notation (BPMN). Meeduse allows to instrument DSLs with formal semantics using the B method. BPMN provides an easy-to-use notation to define the coordination of execution semantics of these DSLs. A transformation of BPMN models into Communication Sequential Process (CSP) formal language enables the possibility for animation and verification. Our approach is successfully demonstrated by modeling the collaboration of two DSLs from a real case study.