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A constraint is a Boolean expression in either a natural language or a machinereadable
language. It refers to one or several model elements and restricts their
semantics.
A constraint is denoted within curly brackets ( Figure 3.91 ). You can optionally
state a name in front of the Boolean expression and separate from it by a colon.
A constraint is denoted either directly next to the model element concerned, or in
a comment symbol that is attached to the model element ( Figure 3.91 ).
FIGURE 3-91
Example for constraints.
class Geometric figure
radius:Integer {radius  0}
Circle Triangle
a:Integer
b:Integer
c:Integer
{c  a  b}
3.10 Other Model Elements
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??? Learn the rules so you know how to break them properly. ???
(14th Dalai Lama)
The Unified Modeling Language (UML) was originally specified as a modeling
language for software development. Thanks to its wide proliferation and its integrated
extension mechanisms, such as stereotypes, it has been used successfully in
other areas as well.


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