SYSML12 — Constraining a decomposition hierarchy

There is a need for a robust mechanism to constrain a system decomposition hierarchy to reflect only selected groupings of parts as motivated by the following example. In particular, assume a rack assembly is composed of a chassis and a set of circuit cards. The rack assembly is constrained by which cards can be inserted in which slots. This includes an optical card in an optical slot, an ethernet card in an ethernet slot and a general slot that can accommodate either an ethernet card or an optical card (source is Nathan Sowatskey example). In addition, a particular rack configuration may include a specific number of each type of slot and card. The need is to constrain the hierarchy to only allow these combinations parts. Generalization sets, redefinition, and other mechanisms can help, but require considerable modeling that is cumbersome. The desired capability is to be able to include a constraint in the rack assembly that constrains the allowable instances of the rack assembly. It is also desirable to specify constraints on nested parts using the dot notation. (Refer to related issue 14998 binding to multiplicity in parameterics).

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