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Vinny,

Take a look at the following resource.  I think it may help with many of the questions that I have seen you asking.

http://www.bpmn.org/Documents/Notations%20and%20Workflow%20Patterns.pdf

This document talk about a number of standard workflow patterns AND how to model thme in both UML and BPMN.  So it's easy to compare and contrast the two notations for both strengths and weaknesses.