code: @Override
      protected Graph doConvert(final VisualizationWrappedRootDoc toConvert) {
  
          final Graph toReturn = new Graph();
  
          // Create subgraphs for each package and add them to the returned Graph.
          toConvert.sortClassesPerPackage().forEach((packageDoc, classDocs) ->
                  toReturn.add(convertPackage(packageDoc, classDocs)));
  
          // All Done.
          return toReturn;
      }
docs: {@inheritDoc}