An extensible interpreter for experimentation with the semantics of Prograph

We describe a prototype tool to assist in the design of the semantics of a visual language based on dataflow, by interpreting an object-oriented representation of a visual program according to a set of semantic rules. The interpreter is written in Scheme and adopts a continuation-passing approach in order to model control flow; it is itself object-oriented and can be readily extended. We use the object-oriented dataflow language Prograph as a case study.