{
  "$ref": "#/definitions/DtTerm",
  "definitions": {
    "DtTerm": {
      "type": "object",
      "properties": {
        "id": {
          "type": "string"
        },
        "name": {
          "type": "string"
        },
        "since": {
          "type": "string",
          "format": "date",
          "description": "ISO 8601 date (YYYY-MM-DD)."
        },
        "until": {
          "anyOf": [
            {
              "anyOf": [
                {
                  "not": {}
                },
                {
                  "type": "string",
                  "format": "date"
                }
              ]
            },
            {
              "type": "null"
            }
          ],
          "description": "ISO 8601 date (YYYY-MM-DD). Null/omitted if ongoing or unknown."
        },
        "until_latest": {
          "anyOf": [
            {
              "anyOf": [
                {
                  "not": {}
                },
                {
                  "type": "string",
                  "format": "date"
                }
              ]
            },
            {
              "type": "null"
            }
          ],
          "description": "ISO 8601 date (YYYY-MM-DD). Latest possible end date."
        },
        "identifiers": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "scheme": {
                "type": "string"
              },
              "identifier": {
                "type": "string"
              }
            },
            "required": [
              "scheme",
              "identifier"
            ],
            "additionalProperties": false
          }
        },
        "note": {
          "type": "string"
        }
      },
      "required": [
        "id",
        "name",
        "since"
      ],
      "additionalProperties": false
    }
  },
  "$schema": "http://json-schema.org/draft-07/schema#"
}