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Otherwise, it wouldn ??™ t be a termination, but
a real new state??”the fi nal state. A terminate state is denoted as a cross without
enclosing circle or rectangle ( Figure 3.66 ).
Fork and join are similar to the elements of the same names from the activity
diagram. A fork has one incoming transition and several outgoing transitions that
lead to different states, positioned orthogonally to one another. This means that all
target states are activated. The outgoing transitions may have neither conditions
nor triggers ( Figure 3.67 ).
FIGURE 3-66
A state machine with termination.
stm Time of day
Day Night
at(sunset)/sleep()
at(sunrise)/getUp()
terminate
FIGURE 3.67
Example for fork and join.
stm Weather
Climate
Night
at(sunset)
at(sunrise)
terminate
Day
warm cold
coldFront
warmFront
terminate
rainy dry
Sun
Clouds
terminate
203
In contrast, a join has several incoming transitions, which originate from states
that are positioned orthogonally to one another, and one outgoing transition
( Figure 3.67 ).
Both elements are denoted as fi lled bars.


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