Conditional execution of modules

[Chip Seraphine]

Is there a good way to have a module fire or not fire based on classes? 
Currently I am doing this by having the classes define alternative 
actionsequences, but this is getting very cumbersome.

(thought:  It would be great if there were a "module:" section that 
could be called at arbitrary points in the actionsequence, and could 
then execute modules with syntax similar to "import".)

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