SYSML21 — The inconsistencies in the SysML v2 representative notation tables regarding “ref part” indicate that the “ref” prefix required by the GBNF for referential parts is missing.

There are inconsistencies in the SysML v2 representative notation tables related to the notation of “ref part”. In particular, several tables—such as Table 4 (Section 7.6.1, p. 38) and Table 11 (Section 7.13.1, pp. 67–68)—do not match the rules defined in the Generalized BNF (GBNF).
According to Section 8.2.3.11 of the GBNF, the part(-def)-name-compartment requires a prefix (e.g., OccurrenceUsagePrefix or DefinitionPrefix) to indicate the element’s role. When the element is referential, the prefix “ref” must be explicitly included.
The omission of the “ref” prefix in these tables does not comply with the GBNF rule, and should be regarded as incorrect. To maintain alignment with the GBNF and ensure clarity in the notation of referential parts, the missing “ref”prefix should be added in the affected tables.