{ "$id":                            "https://schemas.mpai.community/OSD/V1.5/data/Object.json",
  "$schema":                        "https://json-schema.org/draft/2020-12/schema",
  "title":                          "Object V1.5", "description": "Hierarchical object.", "type":  "object",
                                    "required": [ "Header", "ObjectID", "ObjectSpaceTime" ], 
                                    "additionalProperties": false, "properties": {

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

    "BasicObjectCount":             { "type": "integer" },
    "BasicObjects":                 { "type": "array", "items": { "type": "object", "required": [ "BasicObjectIDOrBasicObject" ], 
                                      "additionalProperties": false, "properties": {
      "BasicObjectSpaceTime":       { "$ref": "https://schemas.mpai.community/OSD/V1.5/data/SpaceTime.json" },
      "BasicObjectIDOrBasicObject": { "$ref": "#/$defs/BasicObjectIDOrBasicObject" } } } },

    "SubObjectCount":               { "type": "integer" },
    "SubObjects":                   { "type": "array", "items": { "type": "object", "required": [ "SubObjectIDOrSubObject" ],
                                      "additionalProperties": false, "properties": {
      "SubObjectSpaceTime":         { "$ref": "https://schemas.mpai.community/OSD/V1.5/data/SpaceTime.json" },
      "SubObjectIDOrSubObject":     { "$ref": "#/$defs/SubObjectIDOrSubObject" } } } },

    "BasicObjectOrObject":          { "type": "array", "items": { "$ref": "#/$defs/BasicObjectOrObject" } },

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

  "$defs":                          {

    "BasicObjectIDOrBasicObject":   { "type": "array", "minItems": 1, "maxItems": 1, "items": { "oneOf": [
                                      { "$ref": "https://schemas.mpai.community/OSD/V1.5/data/BasicObject.json" },
                                      { "type": "string" } ] } },

    "SubObjectIDOrSubObject":       { "type": "array", "minItems": 1, "maxItems": 1, "items": { "oneOf": [
                                      { "$ref": "https://schemas.mpai.community/OSD/V1.5/data/Object.json" },
                                      { "type": "string" } ] } },

    "BasicObjectOrObject":          { "type": "array", "items": { "oneOf": [
                                      { "$ref": "https://schemas.mpai.community/OSD/V1.5/data/BasicObject.json" },
                                      { "$ref": "#/$defs/BasicObjectOrObject" } ] } } } }