code: def _get_depthsr(self, goobj):
          
          if 'reldepth' in self.gosubdag.prt_attr['flds']:
              return "R{R:02}".format(R=goobj.reldepth)
          return "D{D:02}".format(D=goobj.depth)
docs: Return DNN or RNN depending on if relationships are loaded.