How to create level limit zone

Path: gameserver/data/zone
Format: XML

Example forbidden on 48 level:

<zone name="[some_zone]" type="epic" >
       <set name="playerMinLevel" val="1" />
       <set name="playerMaxLevel" val="48" />
       <set name="playerLevelLimitBackLoc" val="-25464 172424 -4203" />
   <polygon>
      <coords loc="-23176 185080 -6000 -5500" />
      <coords loc="-20104 185080 -6000 -5500" />
      <coords loc="-20104 177928 -6000 -5500" />
      <coords loc="-23176 177928 -6000 -5500" />
   </polygon>
</zone>

Params:
<set name="playerMinLevel" val="1" /> - minimum level for entering in zone
<set name="playerMaxLevel" val="48" /> - maximum level for entering in zone
<set name="playerLevelLimitBackLoc" val="-25464 172424 -4203" /> - teleport back if conditions not met