Earlier quoted context omitted.
Yeah, except that in our system the graphs are still executable: http://noflojs.org/
So are your components written directly in a "lower level" language (JavaScript etc.) and then the high level structure relating those components defined in the diagrams?
In other environments compatible with the FBP protocol (http://noflojs.org/documentation/protocol/) the components may be written in other languages. For example, MicroFlo components for microcontrollers are C++.