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There can be
more layers, e.g., if you think of the seven layers specifi ed in the OSI layering model.
It makes a lot of sense to look at several layers. But you have to be aware of
the difference, and you have to model the relations. Above all, you should be careful
not to mix the layers. The allocate relationship allows you to defi ne relationships
between elements of different model layers. We use this relationship here to
allocate the standard port of the application layer to the object fl ow port on the
transport layer. You can see the result in Figure 2.77 .
18 The ???I??? stands for ???Interface.??? It is a common naming convention to use the type of model element
as a prefix.
FIGURE 2-76
System structures of the on-board computer.
ibd [block] On-board
computer
:Card reader
:On-board
computer
control
CarControlPort
ICar
:Communication
unit
IBC_ServerCtrl
IBC_ServerData
ServerPort
:Customer card
e:Energy
customer:CustomerPort
CustomerPort
:LED
ICustomerCard ICutomerCard
ICardData
ICardData
IStatusDisplay
IStatusDisplay
121 2.


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