EXPDP Invoking from PL/SQL

One can invoke datapump from PL/SQL -- this might be handy for scheduling a daily or weekly export with DBMS_SCHEDULER.
DECLARE hand NUMBER;
BEGIN hand := Dbms_DataPump.Open(operation => 'EXPORT',
job_mode => 'FULL', job_name 'FULLEXPJOB',
version => 'COMPATIBLE');
Dbms_DataPump.Add_File(handle => hand, filename => 'expdp_plsql.log', directory => 'JAGAT', filetype => 3);
Dbms_DataPump.Add_File(handle => hand, filename => 'expdp_plsql.dmp', directory => 'DMPDIR', filetype => 1);
END;
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