2.6.5 ObjectSpaceObjectStreamHeader
The ObjectSpaceObjectStreamHeader structure specifies the number of objects (see section 2.1.5) in a stream and whether there are more streams following the stream that contains this ObjectSpaceObjectStreamHeader structure.
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Count (24 bits): An unsigned integer that specifies the number of CompactID structures (section 2.2.2) in the stream that contains this ObjectSpaceObjectStreamHeader structure.
Reserved (6 bits): MUST be zero, and MUST be ignored.
A - ExtendedStreamsPresent (1 bit): A bit that specifies whether the ObjectSpaceObjectPropSet structure (section 2.6.1) contains any additional streams of data following this stream of data.
B - OsidStreamNotPresent (1 bit): A bit that specifies whether the ObjectSpaceObjectPropSet structure does not contain OSIDs or ContextIDs fields.