A process tree is a block-structured process model where the (inner) nodes are operators (sequence, choice, parallel, and loop) and the leaves are activities.
The "seq" operator executes its children from right to left.
The "xor" operator executes one of its children.
The "and" operator executes the children in parallel.
The "xor loop" operator models a do-redo loop. The first child is used as the do part, while an exclusive choice between the other children is used as the redo part.
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