{
  "version": 1,
  "name": "A ring constraint",
  "objectTypes": [
    {
      "id": "person",
      "name": "Person",
      "kind": "entity",
      "refMode": "nr"
    }
  ],
  "factTypes": [
    {
      "id": "manages",
      "roles": [
        {
          "id": "manages.r0",
          "objectTypeId": "person"
        },
        {
          "id": "manages.r1",
          "objectTypeId": "person"
        }
      ],
      "readings": [
        {
          "id": "manages.rd",
          "roleOrder": [
            "manages.r0",
            "manages.r1"
          ],
          "text": "{0} manages {1}",
          "isPrimary": true
        }
      ]
    }
  ],
  "subtypeRelations": [],
  "constraints": [
    {
      "id": "uc",
      "kind": "uniqueness",
      "roles": [
        "manages.r1"
      ]
    },
    {
      "id": "rc",
      "kind": "ring",
      "roles": [
        "manages.r0",
        "manages.r1"
      ],
      "types": [
        "irreflexive",
        "acyclic"
      ]
    }
  ],
  "diagram": {
    "shapes": {
      "person": {
        "x": 60,
        "y": 140
      },
      "manages": {
        "x": 250,
        "y": 148,
        "orientation": "horizontal"
      },
      "rc": {
        "x": 276,
        "y": 60
      }
    }
  }
}