new_contents: ## \example Show creation of geometry in an RMF
  
  import RMF
  
  tfn=RMF._get_temporary_file_path("aliases.rmf")
  print "File is", tfn
  
  f = RMF.create_rmf_file(tfn)
  
  r = f.get_root_node()
  
  bf = RMF.BallFactory(f)
  cf = RMF.CylinderFactory(f)
  sf = RMF.SegmentFactory(f)
  
  b = bf.get(r.add_child("ball", RMF.GEOMETRY))
  b.set_radius(1)
  b.set_coordinates([0,0,0])
  
  c = cf.get(r.add_child("cylinder", RMF.GEOMETRY))
  c.set_radius(.5)
  c.set_coordinates([[0,5],[0,5],[0,5]])
  
subject: add trivial geometry example