yes                                                                                                                                                                                                                                                                                                      no                                                                                                                                                                                         
                                                                                                                                                      graphviz_installed?                                                                                                                                                                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
                          process all                                                                                                                                                               process only                                                                                                                                sequence                                                                           and                                                                   activity                                                                                     diagrams
                           diagrams