2.2.6 ExHyperlinkIdRef
Referenced by: ExHyperlinkRefAtom, InteractiveInfoAtom
A 4-byte unsigned integer that specifies a reference to a hyperlink. It MUST be 0x00000000 or equal to the value of the exHyperlinkId field of an ExHyperlinkAtom record (section 2.10.17). The value 0x00000000 specifies a null reference.