# File lib/rgen/model_builder/builder_context.rb, line 295
    def containmentRefs(contextClass, eClass)
      @containmentRefs ||= {}
      @containmentRefs[[contextClass, eClass]] ||=
        eAllReferences(contextClass).select do |r| 
          r.containment && (eClass.eAllSuperTypes << eClass).include?(r.eType)
        end
    end