{ "$id":                              "https://schemas.mpai.community/OSD/V1.5/data/BasicSceneDescriptors.json",
  "$schema":                          "https://json-schema.org/draft/2020-12/schema",
  "title":                            "Basic Scene Descriptors V1.5", "type": "object", 
                                      "required": [ "Header", "BasicSceneDescriptorsID", "BasicSceneDescriptorsSpaceTime" ], 
                                      "additionalProperties": false, "properties": {

    "Header":                         { "type": "string", "pattern": "^OSD-BSD-V[0-9]{1,2}[.][0-9]{1,2}$" },
    "MInstanceID":                    { "type": "string" },
    "BasicSceneDescriptorsID":        { "type": "string" },
    "BasicSceneDescriptorsSpaceTime": { "$ref": "https://schemas.mpai.community/OSD/V1.5/data/SpaceTime.json" },

    "GravityValue":                   { "type": "number" },

    "ObjectCount":                    { "type": "integer" },
    "BasicSceneDescriptors":          { "type": "array", "items": { "type": "object", "additionalProperties": false, "properties": {
      "ObjectSpaceTime":              { "$ref": "https://schemas.mpai.community/OSD/V1.5/data/SpaceTime.json" },
      "ObjectMediaType":              { "$ref": "https://schemas.mpai.community/TFA/V1.5/types/MediaTypes.json" },
      "ObjectIDOrObject":             { "$ref": "#/$defs/ObjectIDOrObject" } } } },

    "DataXMData":                     { "$ref": "https://schemas.mpai.community/AIF/V3.0/data/DataExchangeMetadata.json" },
    "DescrMetadata":                  { "type": "string", "maxLength": 2048 } },

  "$defs":                            {
    "ObjectIDOrObject":               { "description": "Either an embedded Object or an ObjectID (by reference).",
                                        "type": "array", "minItems": 1, "maxItems": 1, "items": { "oneOf": [
                                        { "$ref": "https://schemas.mpai.community/OSD/V1.5/data/Object.json" },
                                        { "type": "string" } ] } } } }