Last year a model was produced to give semantics to an
Application Programmers Interface (API) for Philips Media Systems.
The goal was to get a testable API. The produced model has two faces:
a partially informal "Object Modelling Technique" face and a formal
"COLD-1 plus statecharts" face. Questions are raised like where COLD-1
should stop and statecharts should begin, or how to underpin object view
and behavioural view in a consistent way. More generally, the problem was
encountered to combine formalisms that describe static structure and those
that describe dynamic behaviour. This seems to be a starting point of an
industrial case study in the research area of DeStijl, from which the API
modelling and related standardisation effort may profit.