Both ODS-2 and ODS-5 volume structures support deep nesting of
    directories, subject to the following limits:

    o  There can be up to 255 levels of directories.

    o  The name of each directory can be up to 236 8-bit or 117
       16-bit characters long.

    Complete file specifications longer than 255 bytes are
    abbreviated by RMS when presented to unmodified applications.

    For example, a user can create the following deeply nested
    directory:

    $ CREATE/DIRECTORY [.a.b.c.d.e.f.g.h.i.j.k.l.m]

    A user can create the following directory with a long name on an
    ODS-5 volume:

    $ CREATE/DIRECTORY
    [.AVeryLongDirectoryNameWhichHasNothingToDoWithAnythingInParticular]

  Additional Information (explode) :

• Directory Naming Syntax