2.1.13 Object Group
An object group specifies a subset of objects in a revision manifest (section 2.1.9). An object group MUST NOT be referenced by more than one revision manifest.
An object group MUST be contained within a single file node list (section 2.4). This file node list MUST have the following structure:
FileNode structure (section 2.4.3) with a FileNodeID field value equal to 0x0B4 (ObjectGroupStartFND structure, section 2.5.32).
Global identification table (section 2.1.3).
Zero or more FileNode structures with any of the following FileNodeID field values:
0x08C (DataSignatureGroupDefinitionFND structure, section 2.5.33).
0x0A4 (ObjectDeclaration2RefCountFND structure, section 2.5.25).
0x0A5 (ObjectDeclaration2LargeRefCountFND structure, section 2.5.26).
0x0C4 (ReadOnlyObjectDeclaration2RefCountFND structure, section 2.5.29).
0x0C5 (ReadOnlyObjectDeclaration2LargeRefCountFND structure, section 2.5.30).
0x072 (ObjectDeclarationFileData3RefCountFND structure, section 2.5.27).
0x073 (ObjectDeclarationFileData3LargeRefCountFND structure, section 2.5.28).
FileNode structure with a FileNodeID field value equal to 0x0B8 (ObjectGroupEndFND structure, section 2.4.3).