The compartment of operations is denoted with the heading operations , while
constraints are listed with the heading constraints in the compartment. Altogether
you obtain a tabular representation of the properties of a block. You can arbitrarily
show or hide single compartments in a diagram, and you can add other userspecifi
c compartments. The SysML/UML tool is responsible for providing you with
suitable mechanisms.
In SysML all properties of a block have the visibility public . This means that it
is not necessary to explicitly represent the visibility.
In addition to the text notation, SysML let ??™ s you also represent compartments
in graphical form. The structure compartment contains an internal block diagram
that describes how the block is structured ( Figure 4.30 ). Parts of a block appear as
rectangles in the diagram, while references are shown as rectangles with dashed
lines, and values are not permitted here.
The internal block diagram can also be used as an independent diagram. You
use an internal block diagram to show how the properties of a block are interconnected.
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