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This corresponds to objects in the real world.
FIGURE 4-23
Alternative notation for allocations.
bdd [package] Design [allocation card reader port alternative notation]
Concrete design
Logical design
?«block?»
On-board computer
control
?«block?»
On-board computer
control
CardReaderPort
RS232
allocatedTo
?«port?» RS232
allocatedFrom
?«port?» CardReaderPort
Defi nition
An allocation is an abstract relationship between elements of different type, or
on different levels. It allocates a target element to one or more source elements.
It is a stereotype ?«allocate?» of the UML element abstraction.
Common aspects such as structure and behavior are initially considered separately
in the modeling work. 4 The concrete binding??”say, behavior XY is executed on or
by a structure ABC ??”follows only later. The allocation relationship allows you to
express this relation in an early stage. The relationship is abstract in the sense that
it describes, for example, how a behavior is allocated to a structure, but doesn ??™ t
say anything about how exactly this allocation looks like.


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