How to Launch Workflow from PL/SQL

How to Launch Workflow from PL/SQL

declare
v_itemtype VARCHAR2(50);
v_itemkey VARCHAR2(50);
v_process VARCHAR2(50);
v_userkey VARCHAR2(50);
begin
v_itemtype := 'DEMOWF';
v_itemkey := '1233';
v_userkey := '1233';
v_process := 'DEMOPROCESS';
WF_ENGINE.Threshold := -1;
WF_ENGINE.CREATEPROCESS(v_itemtype, v_itemkey, v_process);
wf_engine.setitemuserkey(v_itemtype, v_itemkey, v_userkey );
wf_engine.setitemowner (v_itemtype, v_itemkey,'SYSADMIN');
WF_ENGINE.STARTPROCESS(v_itemtype, v_itemkey);
commit;
exception when others
then
dbms_output.put_line(SQLERRM);
end;



*/