How to enable party restricted zone

Path: data/zone/
Parameter: <set name="noParty" val="true" />

Example to enable in zone:

    <zone name="[queen_ant_epic_fun]" type="fun" >
        <set name="enabled" val="true" />
        <set name="noParty" val="true" />
        <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>