<?xml version="1.0"?>
<periods>
<period name="5x8" desc="open hour">
    <perioditem>
        <days start="1" end="5"/>
        <hours start="8" end="18"/>
    </perioditem>
</period>
<period name="8-18" desc="work hour">
    <perioditem>
        <hours start="8" end="18"/>
    </perioditem>
</period>
<period name="0-12" desc="AM">
    <perioditem>
        <hours start="0" end="12"/>
    </perioditem>
</period>
<period name="12-24" desc="PM">
    <perioditem>
        <hours start="12" end="24"/>
    </perioditem>
</period>
<period name="long" desc="date example"> 
    <perioditem>
        <dates start="1128282" end="323232323"/>
    </perioditem>
</period>
<period name="interval" desc="one hour interval">
    <perioditem>
        <!-- Duration in second (1 hour) -->
        <duration length="3600"/>
    </perioditem>
</period>
</periods>