{ "$schema":                "https://json-schema.org/draft/2020-12/schema",
  "$id":                    "https://schemas.mpai.community/MMM4/V2.2/data/Message.json",
  "title":                  "Message V2.2", "type": "object", "properties": {

    "Header":               { "type": "string", "pattern": "^MMM-MSG-V[0-9],{1,2},[.][0-9],{1,2}$" },

    "MInstanceID":          { "type": "string" },
    "MessageID":            { "type": "string" },

    "MessageData":          { "type": "array", "items": { "anyOf": [

                            { "type": "object", "properties": { "MessageID": { "type": "string" } } },
                            { "type": "object", "properties": { "MessageData": { "type": "string" } } },
                            { "type": "object", "properties": {
                                "DataLength":  { "type": "integer" },
                                "DataURI":     { "type": "string", "format": "uri" } } } ] } },

    "Rights":                 { "$ref": "#/$defs/Rights" },
    "DataExchangeMetadata":   { "$ref": "https://schemas.mpai.community/PTF/V1.0/data/DataExchangeMetadata.json" },
    "Trace":                  { "$ref": "https://schemas.mpai.community/AIF/V3.0/data/Trace.json" },
    "DescrMetadata":          { "type": "string", "maxLength": 2048 } },

  "$defs":                    {

    "Rights":                 { "type": "array", "minItems": 1, "items": { "oneOf": [

      { "type": "object", "additionalProperties": false, "required": [ "Right" ], "properties":
        { "Right": { "$ref": "https://schemas.mpai.community/MMM4/V2.2/data/Right.json" } } },

      { "type": "object", "additionalProperties": false, "required": [ "RightID" ], "properties":
        { "RightID": { "type": "string" } } } ] } } } }