In the domain of heterogeneous model composition, semantic
adaptation is the "glue" that is necessary to assemble heterogeneous
models so that the resulting composed model has well-defi ned semantics.
In this paper, we present an execution model for a semantic adaptation
interface between heterogeneous models. We introduce a Domain-Specifi c
Language (DSL) for specifying such an interface explicitly using rules,
and a transformation toward the ModHel'X framework. The DSL enables
the modeller to easily customise interfaces that fit the heterogeneous
model at hand in a modular way, as involved models are left untouched.
We illustrate the use of our DSL on a power window case study and
demonstrate the importance of defi ning semantic adaptation explicitly
by comparing with the results obtained with Ptolemy II.
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