SYSML21 — Missing Modifiers, Extension Keywords in Ends Compartment

Currently, the usage appearance in end compartment are declared in “8.2.3.14 Interfaces Graphical Notation” chapter like that:

ends-compartment-element = QualifiedName (’:’ QualifiedName)?

It is not consistent with all other compartments, e.g. parts, ports:

parts-compartment-element = el-prefix? OccurrenceUsagePrefix usage-cp
ports-compartment-element = el-prefix? OccurrenceUsagePrefix usage-cp

It should be aligned with those with one simple modification that skips the ‘end’ prefix declaration:

ends-compartment-element = el-prefix? BasicUsagePrefix UsageExtensionKeyword* usage-cp