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  22.2.1 Dictionary Formats
  CDD/Repository allows the following types of dictionaries:

  .
        DMU-format dictionary
  .
        CDO-format dictionary

  These dictionaries can coexist on a system to form one logical
  directory structure. CDD/Repository uses a special dictionary,
  known as the compatibility dictionary, that allows an appli-
  cation to refer to dictionary definitions without concern about
  which type of dictionary format the definitions are stored in.

  The compatibility dictionary is a CDO-format dictionary
  whose directory hierarchy matches that of the DMU-format
  dictionary (if any) on the system.


                                            Note

        The compatibility dictionary is an installation op-
        tion for CDD/Repository. If there is no compatibility
        dictionary, an application program can refer to both
        types of dictionaries. In this case, refer to the CDO-
        format dictionary with an anchor origin path name
        and to the DMU-format dictionary with a CDD$TOP
        path name. Anchor origin path names are described
        in Section 22.2.2.

  Refer to the CDD/Repository documentation for detailed
  information about the CDO utility and the compatibility
  dictionary.