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Environment/Versions TTworkbench, Windows, Linux, 32/64bit Answer According to standard ES 201 873-1, chatper 6.2.0, "Where applicable TTCN-3 type definitions may be recursive. The user, however, shall ensure that all type recursion is resolvable and that no infinite recursion occurs." Example:         // Valid recursive record type definition     type record MyRecord1 {     FieldType1 field1,     MyRecord1 field2 optional,     FieldType3 field3     }     // Invalid recursive record type definition causing an error     type record MyRecord2 {     FieldType1 field1,     MyRecord2 field2,     FieldType3 field3     }