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This is not a workflow engine but rather a rules engine. A workflow engine is like a navigating a directed graph or a flowchart. Executing one node would take you to the same or different node based on some rules. So a rules engine is typically a part of a workflow engine or invoked by it.

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There are two types of workflow engines: sequential and finite state machines. The latter is more general and includes the former. In a finite state machine external event let you move through the nodes of a graph. The present node is the state. In workflow.py the creation/update of a file is the external event. The state is also characterized by the files present in the file system. The change of state is associated to the execution of a program. I agree it is a little different than what people are used to and I am not arguing semantics. It was useful to me. Hope it is useful to others. That is all. I will be happy to take patches to improve functionality.

Sorry, if I sounded argumentative. I just shared what somebody's perception could be when they read the title 'Workflow Engine'. It took me a while to understand that probably 'Rules Engine' would have been a better nomenclature.

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