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More specifi cally, it ??™ s not objects that fl ow through the activity, but object
tokens. Think of the term object or data in the widest sense of the words. Either
can be data within a software application, but also purely physical elements, such
as liquids, electric current, gases, or forces.
We use pins in actions to model incoming and outgoing data. A pin is a small
rectangle that is attached to an action. The name of the object is written next to
the rectangle. We distinguish between input pins and output pins, depending on
whether arrows point to the pin or away from it ( Figure 2.60 ). Though the notation
for pins is similar to that for ports, they have nothing in common.
We are now ready to add the object fl ow to our activity for the use case start
car usage . We don ??™ t need an object or block model yet to do this. We defi ne the
Table 2.14 Summary: Modeling the object fl ow.
Reference card: Model object fl ow.
Incoming and outgoing data
::Use cases [detailed]:
Detailed fl ow description, including
exceptions and variants.


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