From the course: Systems Engineering with SysML
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Usage and memberships
From the course: Systems Engineering with SysML
Usage and memberships
- [Instructor] The type of usage we just saw in the oven example is a composite usage which models a part integral to the structure of the containing part. So in our example, the element defined as racks is an integral part of test oven. The graphical notation for composite usage, as we saw before, is a black diamond connecting the two parts. Moving on, the second form of usage is reference usage. Reference usage is a non-compositional usage in which some element is referred to without being a part of it. For example, the test oven model shown here needs to be installed in a building. So the test oven has to refer to the building. This is modeled as ref building defined by building. The keyword, ref, is optional, but it helps if we mention it for clarity. In graphical notation, the reference usage is denoted by a hollow diamond as shown in the example here. Now let us update our list of notations by adding the notation for reference usage where we have the arrow with the hollow…
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