All raw data structures and substructures are held in longword arrays. They start with a 32-bit length field which counts the number of 16-bit data words in the structure. If not stated otherwise, this word count excludes the length field and the type/subtype field. The second field contains the type/subtype specification. This organization allows a program to skip uninteresting data by just fetching the length counter and inspecting the type/subtype field. A negative event or subevent type indicates that the data structure under consideration contains an error trailer.
Plastic Wall Data Structures (preliminary)
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Tue May 28 15:33:35 CST 1996