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.