A.1:4.4 - U.System

U.System is an acting physical or operational holon kind. It can participate in system-role assignments, capability relations, method enactment, mechanism realization, work occurrences, transformations, functioning relations, and responsibility-bearing claims when their direct patterns make those claims current.

Its kind-specific condition is acting eligibility: the recognized whole has an actual physical or operational organization through which it can causally participate in work or transformation while preserving its identity. Capability evidence or actual participation can support a classification assertion; a U.SystemRoleAssignment, work occurrence, or capability relation does not create the system by participation alone.

Keep those relations separate:

• Use A.2.1 to state the U.SystemRoleAssignment occurrence whose HolderSystemSlot is filled by the system.
• A.2.2 governs capability claims about that system.
• A.3.1, A.3.2, and the mechanism family govern method, method description, and mechanism realization.
• A.15.1 governs independently admitted performed Work; recover its actual performer’s agency basis through A.13, and use F.6 only when precise assignment-bound attribution is needed.
• A.3.4 governs the bounded transformation; the exact direct subject-relation pattern defines or constrains the system’s participation in it.
• Functioning, evidence, assurance, temporal, and dynamics claims remain with their direct patterns.

A.1 introduces no omnibus participation relation over references to all those occurrences. Listing them together in a worked case creates no additional world-side relation. If the selected organization among several direct relations changes an engineering decision, select that organization as U.Structure under A.22 and keep every constituent occurrence under its direct identity. Claim scope, effective reference scheme, and optional model-use structure qualify each dependent assertion only where its direct pattern makes them current.