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Chapter 20. Approval Workflow for Messages > The Theory Behind Workflows

The Theory Behind Workflows

Now that you have completed the practical part of the chapter, it is time to look a bit more carefully at the framework that supports all this functionality. The workflow framework is designed to support any type of generic workflow implementation. The Zope community itself has produced two workflow implementations: the activity and entity models.

Activity-based workflows implement workflow in a transition-centric fashion, where an object is moved in a graph of workflow states and transitions outside its physical hierarchy. This type of model was developed by the Workflow Management Coalition (WfMC) and is implemented in the Zope 2 OpenFlow/CMFFlow product. The advantage of this model is that it has a high degree of flexibility and scalability, and it is well established, thanks to the WfMC.


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