<sid>User_A</sid>
 <oid> O11</oid>
 <Ts>2014-1-1</Ts>
 <Te>2014-12-31</Te>
 <ko>********</ko>
 <Permission>
   <Action>
     <Role>A</Role>
     <Time>
       <after>8:00am</after>
       <before>10:00am</before>
     </Time>
     <Environment>
       <IP>
         <from>172.16.1.5</from>
         <to>172.16.1.35</to>
       </IP>
     </Environment>
   </Action>
   <PerDes>read&write</PerDes>
 </Permission>
Algorithm 3