Common Mechanisms of UML

v  In simple cases, the transactions have a unique identify from the time they are created to the time they are completed

v  In many systems the transactions can give birth to others, and transaction can also merge

Births: There are three different possible interpretations of the decision symbol or nodes with two or more out links. It can be a Decision, Biosis or Mitosis

Decision: Here, the transaction will take one alternative or the other alternative, but not both

Biosis: Here the incoming transaction gives birth to a new transaction and both transactions continue on their separate paths, and the parent retains its identify

Mitosis: Here, the parent transaction is destroyed and two new transactions are created

Mergers: Transaction flow junction points are potentially as trouble some as transaction flow splits
Ordinary Junction: An Ordinary junction is similar to junction in a control flow graph. A Transaction can arrive either on one link or the other.

Absorption: In absorption case, the predator transaction absorbs prey transaction. They prey vanishes but the predator retains its identity.

Conjugation: In Conjugation case, the two parent transactions merge to form a new daughter. In keeping with the biological flavor, this case is called as conjugation.