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                  "minLength": 1
                }
              },
              "required": [
                "status",
                "reason"
              ],
              "additionalProperties": false
            }
          ]
        },
        {
          "type": "object",
          "properties": {
            "status": {
              "const": "known"
            },
            "at": {
              "type": "string",
              "minLength": 1,
              "format": "date-time"
            },
            "precision": {
              "type": "string",
              "minLength": 1
            }
          },
          "required": [
            "status",
            "at"
          ],
          "additionalProperties": false
        }
      ]
    },
    "relationship": {
      "type": "object",
      "properties": {
        "entryId": {
          "type": "string",
          "minLength": 1,
          "format": "uri"
        },
        "role": {
          "enum": [
            "supports",
            "contradicts",
            "derivedFrom",
            "selectedFor",
            "context"
          ]
        },
        "reason": {
          "type": "string",
          "minLength": 1
        }
      },
      "required": [
        "entryId",
        "role"
      ],
      "additionalProperties": false
    }
  }
}