{
  "schema_version": "1.0",
  "id": "component.reference.housing",
  "version": "1.0.0",
  "kind": "housing",
  "virtual": true,
  "roles": ["housing", "ground_reference"],
  "parameters": {},
  "ports": [
    {"id": "stationary_mount", "type": "port.mount.stationary", "multiplicity": "many"},
    {"id": "main_axis", "type": "port.reference.axis", "multiplicity": "one"}
  ],
  "capability_refs": ["capability.validation.fixed"],
  "applicability": {
    "note": "Topology reference; physical housing details are represented by industrial assembly knowledge."
  },
  "maturity": "production"
}