{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "jmri-json-server-message",
    "type": ["object", "array"],
    "description": "Message from JMRI to client",
    "definitions": {
        "jmri-json-server-message": {
            "anyOf": [
                {
                    "type": "object",
                    "description": "Message from JMRI to client with data",
                    "properties": {
                        "type": {
                            "type": "string",
                            "description": "Data type if data is present, message type otherwise",
                            "pattern": "^((?!(pong|goodbye)).)*$"
                        },
                        "data": {
                            "anyOf": [
                                {
                                    "type": "object",
                                    "description": "Data carried in message, see individual types for valid schemas"
                                },
                                {
                                    "type": "array",
                                    "items": {
                                        "type": "object"
                                    }
                                }
                            ]
                        },
                        "method": {
                            "type": "string",
                            "enum": ["get", "put", "post", "delete", "list"],
                            "description": "HTTP Method equivalent advisory to the client to inform the client of a need to take an action on an object (for example, will be \"delete\" if advising a client that the client should delete an object that was deleted by the server); will not be present on objects merely being updated or added"
                        },
                        "id": {
                            "type": "integer",
                            "description": "A message id previously assigned by the client and returned unmodified in messages in direct response to the message from the client"
                        }
                    },
                    "additionalProperties": false,
                    "required": ["type", "data"]
                },
                {
                    "type": "object",
                    "description": "Message from JMRI to client without data (only known types)",
                    "properties": {
                        "type": {
                            "type": "string",
                            "description": "Message type",
                            "enum": ["pong", "goodbye"]
                        }
                    },
                    "additionalProperties": false,
                    "required": ["type"]
                }
            ]
        }
    },
    "anyOf": [
        {
            "$ref": "#/definitions/jmri-json-server-message"
        },
        {
            "type": "array",
            "description": "Multiple results in response to client message",
            "items": {
                "$ref": "#/definitions/jmri-json-server-message"
            }
        }
    ]
}