VMS Help CMS, SET, ACL, Qualifiers, /OBJECT_TYPE=type  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Specifies the type of the object whose ACL is being modified.
    There is no default object type; therefore, this qualifier is
    required. The type must be one of the following keywords:

       CLASS
       ELEMENT
       GROUP
       LIBRARY
       COMMAND