Workflow patterns, BPMN and Petri nets
You find a description of the Workflow Patterns at http://workflowpatterns.com
a) What is the difference between the patterns Exclusive Choice
(XOR-Split) and Deferred Choice
b) How are they represented in BPMN and Petri nets?
More information on the Workflow Patterns can be found in the book in chapter 4.1.