- make Classifer.useCase  navigable as UML 2.2 specifies that classifier   is extended with useCase attribute (seems like same mistake in   case of UseCase.subject on the use cases diagram)
- make Classifer.useCase  navigable as UML 2.2 specifies that classifier
  is extended with useCase attribute (seems like same mistake in
  case of UseCase.subject on the use cases diagram)

amolenaar/gaphor,amolenaar/gaphor