Each partition stands for a structure (e.g., a class) and contains
the corresponding actions. Moreover, a control node, such as a decision node or
a fork node, as well as edges can be assigned to a partition. However, the focus is
clearly on actions. Grouping criteria other than structures are possible as well.
Still common is the UML 1 name for this model element: swimlane .
One single partition is denoted by drawing a frame around the activity region
( Figure 3.55 ). The name of the partition goes in a separate area. It describes the
grouping criterion. If the grouping criterion is a model element, then the type of
element can be denoted within Guillemets 15 above the name.
15 French quotation marks, also called ???angle quotes.???
192 CHAPTER 3 UML??”Unifi ed Modeling Language
3.7 The State Machine Diagram
A system is always in a state that abstracts a combination of values given in the
system. Events arriving at the system lead to reactions??”depending on the state??”
that change values and results in new states.
A state machine diagram describes this behavior.
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