Process Instances

A BPEL4WS workflow is like a class.
An instance is created when an activity (receive) occurs which has createInstance="yes".
Every workflow must have at least one such start activity.
If more than one, they must be correlated using a correlationset.
The instance dies when either
1. It reaches the end of the workflow.
2. It raises a fault.
3. It is terminated by <terminate>
4. A compensationHandler is called.