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The result can be quite messy. To solve the problem,
you can conduct such edges through a ??? tunnel. ??? Both the entry and the exit
of the tunnel are denoted with a small circle that has a unique identifi er in pairs
( Figure 3.47 ). The UML specifi cation calls this notation variant ??? connector, ??? not to
be confused with the connector used in composite structure diagrams.
3.6.5 Initial and Final Nodes
Defi nitions
An initial node is the starting point for a control flow that is started as the
activity is invoked.
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A control token is placed on each initial node, thus starting a flow, as soon as an
activity is invoked. An activity can have from none to any number of initial nodes.
If there are more than one initial nodes, then there are concurrent flows right at
the start of the activity ( Figure 3.46 ). An initial node is denoted as a black filled
circle ( Figure 3.46 ).
An activity fi nal node terminates the entire activity as soon as a token hits the
node, regardless of how many other tokens (i.e., fl ows) are still underway in that
activity ( Figure 3.


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