30.3.5 Joining or Leaving a Layer

To join a layer the PLM instproc add-layer is called. This instproc calls the PLMLayer instproc join-group which calls the PLMLayer/ns instproc join-group. To leave a layer the PLM instproc drop-layer is called. This instproc calls the PLMLayer instproc leave-group which calls the PLMLayer/ns instproc leave-group.