{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "properties": {
    "flowId": {
      "type": "string",
      "pattern": "^[A-Fa-f\\d]{24}$"
    },
    "oldVersion": {
      "type": "string",
      "minLength": 1,
      "maxLength": 255
    },
    "newVersion": {
      "type": [
        "string",
        "null"
      ],
      "minLength": 1,
      "maxLength": 255
    }
  },
  "additionalProperties": false,
  "required": [
    "flowId",
    "oldVersion",
    "newVersion"
  ]
}