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Since there is no uniform standardized catalog here, SysML does not dictate
categories. Use the extension mechanism of stereotypes to add your projectspecifi
c categories in the modeling language. Section 5.3 describes the categories
of the SYSMOD profi le.
Of course, the requirements are not isolated from one another. One requirement
results from another or is part of another requirement. It is important to
model these relationships to ensure that future changes to requirements, which
always occur, can be integrated into the model in a reproducible way.
There are requirements on different hierarchical levels. Generally formulated
requirements are broken down into several sub-requirements which, in turn, are
broken down into several detail requirements, and so on. We use the containment
relationship to model the requirements hierarchy ( Figure 2.8 ).
Some requirements can be derived from existing requirements. For example,
we have the size of the DIN 6
radio compartment where the central unit enclosure
is to be built in.


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