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These parameters are denoted as rectangles (without
rounded corners) on the edge of the activity rectangle, and the name of the
parameter is inside. This is normally the name of the parameter type ( Figure 3.36 ).
However, it is also possible to assign a name, regardless of the type. The syntax has
the pattern  name  :  Type  .
One particularity is the possibility of a stream property for input and output
parameters. If it is activated, then the activity can accept or supply new data
through the parameters in running operation. Compared to an assembly line, this
means that you can continually put new work pieces on the assembly line and
have them transported in a machine (  activity). In the end, the fi nished elements
come out of the running assembly line. Without fl ow property??”the standard
behavior of activity parameters??”you would put a work piece on the assembly
line, the machine (  activity) would switch on and produce a result, and switch
off again. Subsequently, you could put the next work piece on the assembly line,
and so on.


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