THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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The binding components deal with all the plumbing and protocol stuff, then service engine components work on a logical XML layer, providing content based routing, orchestration, rules, scripting, transformations and custom enrichment etc.
A JBI container can handle plugin JBI components; so for example components developed in the Celtix project will all hot deploy right inside ServiceMix.
Steve Vinoski has written a good overview
If you need more help, try these links