Beginning in Version 7, you can associate a SAS libref directly with a database, schema, server, or group of tables and views, depending on your DBMS. To assign a libref to DBMS data, you must use the ...
is any valid libref as doc umented in SAS Language Reference: Dictionary. The SAS System reserves some librefs for special system libraries. See Librefs Assigned by SAS for more information. differs ...