{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "http://collmot.com/schemas/flockwave/1.0/message.json",

  "oneOf": [
    {
      "$ref": "#/definitions/standardMessage"
    },
    {
      "$ref": "#/definitions/errorMessage"
    }
  ],

  "definitions": {
    "standardMessage": {
      "type": "object",

      "properties": {
        "$fw.version": {
          "$ref": "definitions.json#/versionNumber"
        },
        "id": {
          "$ref": "definitions.json#/messageId"
        },
        "refs": {
          "$ref": "definitions.json#/messageId"
        },
        "body": {
          "$ref": "message_body.json#"
        }
      },

      "required": ["$fw.version", "id", "body"]
    },

    "errorMessage": {
      "type": "object",

      "properties": {
        "$fw.version": {
          "$ref": "definitions.json#/versionNumber"
        },
        "id": {
          "$ref": "definitions.json#/messageId"
        },
        "refs": {
          "$ref": "definitions.json#/messageId"
        },
        "error": {
          "type": "object",
          "properties": {
            "code": {
              "type": "integer"
            },
            "message": {
              "type": "string"
            }
          },
          "minProperties": 1
        }
      },

      "required": ["$fw.version", "id", "error"]
    }
  }
}