json_schema: {
      "$schema": "http://json-schema.org/draft-07/schema#",
      "$id": "https://mcda.drugis.org/emptyPerformance.json#",
      "title": "MCDA empty performance for the performance table entry of absolute data",
      "type": "object",
      "required": [
          "type"
      ],
      "additionalProperties": false,
      "properties": {
          "type": {
              "type": "string",
              "enum": [
                  "empty"
              ]
          },
          "value": {
              "type": [
                  "string",
                  "number"
              ]
          }
      }
  }