| Definition | Functional Requirements | Syntax | Semantics | Conformance Testing | Performance Assessment |
1 Definition
A Data Type including a collection of Basic Objects possibly of different Media Types.
An Object can have a hierarchical structure where Objects contain Basic Objects and Objects.
2 Functional Requirements
An Object may include:
- ID of a Virtual Space (M-Instance) where it is or intended to be located.
- ID of the Object.
- Space-Time information of the Object.
- Basic Object and Objects included in the Objects.
Note that.
- An Object that does not include Objects but only one Basic Object is a Basic Object.
- The Space-Time information of a Basic Object, Object, or Basic Scene included in an Object may be superseded by the Space-Time information of the Object containing it.
The following table gives the Media Type-specific Objects.
| Acronym | Object name | JSON |
| OSD-3DO | 3DModel Object | Link |
| OSD-AUO | Audio Object | Link |
| OSD-AVO | Audio-Visual Object | Link |
| OSD-LIO | LiDAR Object | Link |
| OSD-OMO | Map Object | Link |
| OSD-RAO | RADAR Object | Link |
| OSD-SPO | Speech Object | Link |
| OSD-TXO | Text Object | Link |
| OSD-USO | Ultrasound Object | Link |
| OSD-VIO | Visual Object | Link |
3 Syntax
https://schemas.mpai.community/OSD/V1.5/data/Object.json
4 Semantics
| Label | Description |
| Header | Object Header – Standard “OSD-OBJ-Vx,y” |
| MInstanceID | Identifier of M-Instance. |
| UEnvironmentID | Identifier of U-Environment. |
| ObjectID | Identifier of the Object. |
| Objectime | Time this Object was produced. |
| BasicObjectCount | Set of Parent Objects. |
| BasicObjects[] | Set of Basic Objects. |
| – BasicObjectSpaceTime | Space Time of a Basic Object in the Object. |
| – BasicObject | A Basic Object in the Object. |
| ObjectCount | Set of Child Objects. |
| Objects[] | Set of Objects. |
| – ObjectSpaceTime | Space Time of an Object in the Object. |
| – Object | An Object in the Object |
| DataXMData | Information about this Object Instance. |
| DescrMetadata | Descriptive Metadata |
5 Conformance Testing
A Data instance Conforms with Object (OSD-OBJ) if:
- The Data validates against the Object’s JSON Schema.
- All Data in the Object’s JSON Schema
- Have the specified type
- Validate against their JSON Schemas
- Conform with their Data Qualifiers.
