code: def objectid_valid(i):
          
          if "." not in i:
              return False
          parts = i.split(".")
          if len(parts) == 3:
              try:
                  [int(x) for x in parts]
                  return True
              except Exception:
                  pass
              return False
docs: Test if a string looks like a regular object id of the
              form:::
  
                 xxxx.yyyyy.zzzz
  
              with those being numbers.