A.22.CGUS:10 - Rationale

The recurring object is a thin specialization of A.22 U.Structure, not a new root kind. Constraint-based process modeling, object-centric querying, artifact-centric modeling, acausal modeling, and FPF pattern use all distinguish a constraint-bearing structure from a performed trace, work order, view, publication, solver run, or example path.

The same distinction appears in acausal engineering models: component relations and constraints can be stated before an analysis chooses a calculation direction. FPF adopts only that general separation. Mathematical models, analyses, executions, results, and publications keep their own kinds and rules.