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In case of
associations you have to be careful not to confuse the information fl ow with the
direction in which the association names are read.
A bi-directional information fl ow is denoted by two arrows or two triangles.
There are no real bi-directional information fl ows.
3.10.4 Comment
A comment is a note in text form that can be attached to any element.
In all model areas there is a need to place comments. A comment may be
required either to point open issues, or to explain a complicated situation, or to
provide general information for the reader.
A comment is denoted as a rectangle with a dog ear on the upper right corner,
and it is attached to the commented element by a dashed line.
The comment symbol is often used in UML to capture free text in a diagram.
For example, you can denote a constraint in comment form. In this case, however,
it is merely the comment notation but not a real comment. A constraint appears
in the model.
3.10.5 Constraint
Defi nition
A constraint is a condition that always has to be met, and which restricts the
semantics of model elements.


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