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• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.2.7 Structures with optional fields
  following is an example of a structure with optional fields using C++ syntax: struct TypeA { Int32 X; Int32* O1; SByte Y; Int32* O2; }; O1 and O2 are optional fields which ... NULL if not present An instance of TypeA which contains two mandatory (X and Y) and two optional (O1 and O2) fields would be encoded as a byte sequence