A path name consists of a string of given names separated by periods.
  It uniquely identifies a dictionary directory, subdictionary, or
  object through its line of ancestry from CDD$TOP.

  For example, you can specify the dictionary directory STANDARDS in
  the sample dictionary with the following path name:

  CDD$TOP.PERSONNEL.STANDARDS

  The following is not a legal path name because a path name cannot
  contain consecutive periods:

  CDD$TOP..PERSONNEL