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The relations between properties of different blocks can be described and
defi ned in a parametric diagram. The constraints form a network across all properties
of the blocks.
Figure 4.44 shows a system that describes (strongly simplifi ed) the world of
Sir Isaac Newton. We will use this not entirely serious model below to model the
legendary fall of an apple on Newton ??™ s head.
4.6.1 Constraint Block
FIGURE 4-43
The ???complex??? and ???real??? data types.
bdd [modelLibrary] Blocks
?«valueType?»
Real
realPart:Real
imaginaryPart:Real
?«valueType?»
Complex
Defi nition
A constraint block describes constraints on system structures and the parameters
required.
It is a stereotype ?«constraintBlock?» (or ?«constraint?» for short) as a specialization
of the SysML stereotype ?«block?».
A constraint block is defi ned free from any context, so that it can easily be reused.
This allows you to defi ne a constraint library so that you ??™ ll be able to pick constraints
for various projects.
Formulated constraints are regular UML constraints.


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