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• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.2.8 Unions
  syntax: struct Type2 { Int32 A; Int32 B; }; struct Type1 { Byte Selector; union { Int32 Field1; Type2 Field2; } Value; }; In the C/C++ example above, the Selector, Field1 and Field2 are semantically coupled ... byte sequence depends on the selected field. An instance of Type1 where field Field1 is available would be encoded as 8-byte sequence. If the instance of Type