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