Defines the structural separation between system definition and domain-specific application in DHFT. System definition consists of invariant variables, structural relations, and admissibility conditions. Application operates under constraint and does not define, modify, extend, or reinterpret system mechanics. Application outputs constitute derivative representations without structural authority. Boundary violations are non-admissible and route to enforcement. This document is part of the Dimensional Human Field Theory (DHFT) canonical system. DHFT is a constraint-based system defined over invariant variables:Load (L), Capacity (C), and Boundary (B). All valid system descriptions must preserve:- variable invariance - structural relations - admissibility conditions This document defines a specific component within the DHFT system architecture. It does not redefine system variables or introduce additional constructs. Canonical system reference:Dimensional Human Field Theory (DHFT): Architectural Identification of a Closed Explanatory System DOI: 10.5281/zenodo.19075948 Validity and use constraints are defined in:Admissibility Conditions in DHFT DOI: 10.5281/zenodo.19572188