[jboss-user] [JBoss jBPM] - rules engine, bpm, esb, msg'ing - functionality overlap?

[hanasakijiji]

This is a business / architectural question - not necessarily a technical one.

Looking for a paper/whitepaper etc discussing how the three of these all work together in an enterprise environment.

As far as I can tell:
Messaging gives an implementation under the JMS API and perhaps an adapter to something like IBM MQ
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  | ESB gives webservices and often, not though not exclusively, a XML/SOAP layer on top of msg'ing.  It also gives transformations, ACID transactions and a process flow (maybe session beans or maybe a scripting language like IBM broker)
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  | BPM gives a process flow with ACID transactions and a cool GUI for modeling the flow.   A primary language used for BPM modeling is XML for BPEL
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  | A rules engine also models a business process.  It can be a java lib called by a session bean or the rules can be exposed as webservices from their own 'container' like ILOG and others.
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  | So, what processes go in the rules engine? in BPM?  In the ESB?
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  | When is it best to embed the rules code behind a sessionbean (maybe exposed as a WebService), called be the esb code? called by the bpm code?  In a Rules container and centralized?
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