In CDX files, this data type consists of a series of CDXObjectID followed by a UINT16. The first value indicates which other object is relevent, and the second value indicates which propery of that other object is referenced by this object.
In CDXML files, this data type is represented by a represent object.
|CDX:||06 00 00 00 21 04|
|CDXML:||<represent attribute="Charge" object="6"/>|
See the complete list of CDX data types