{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "description": "The Ditto Protocol error response is sent in response to a command that failed during execution.",
  "title": "Ditto Protocol error response",
  "properties": {
    "topic": {
      "type": "string",
      "description": "Contains the topic of the error including on which channel it was issued."
    },
    "headers": {
      "type": "object",
      "description": "Additional headers.",
      "properties": {
        "correlation-id": {
          "type": "string",
          "description": "The correlation-id header is used for linking one message with another. It typically links a reply message with its requesting message."
        }
      },
      "required": [ "correlation-id" ]
    },
    "path": {
      "type": "string",
      "description": "The path is always `/` for error responses."
    },
    "value": {
      "type": "object",
      "description": "The _value_ field contains information about the error that occurred.",
      "properties": {
        "status": {
          "type": "integer",
          "title": "Error status",
          "description": "The status code of the error with HTTP status code semantics (e.g.: 4xx for user errors, 5xx for server errors)."
        },
        "error": {
          "type": "string",
          "title": "Error code",
          "description": "The error code or identifier that uniquely identifies the error e.g. `things:features.notfound`."
        },
        "message": {
          "type": "string",
          "title": "Error message",
          "description": "The human readable message that explains what went wrong during the execution of a command/message."
        },
        "description": {
          "type": "string",
          "title": "Error description",
          "description": "Contains further information about the error e.g. a hint what caused the problem and how to solve it."
        },
        "href": {
          "type": "string",
          "title": "Error link",
          "description": "A link to further information about the error and how to fix it."
        }
      },
      "required": [
        "status",
        "error",
        "message"
      ]
    },
    "status": {
      "type": "integer",
      "description": "The status code that indicates the result of the command. The semantics of the used status codes are based on the [HTTP status codes](https://tools.ietf.org/html/rfc7231#section-6)."
    }
  },
  "required": [ "topic", "headers", "path", "status" ]
}