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  <record name="LCIOIndex">
     <block name="LCIOIndex" major="1" minor="0">
         <data type="int" name="controlWord">
            Bit 0 = single Run
            Bit 1 = long offset required
         </data>
         <data type="int" name="runMin"/>
         <data type="long" name="baseOffset"/>
         <data type="int" name="size"/>
         <repeat count="size">
             <if condition="(controlWord&amp;1)==0">
                <data type="int" name="runOffset">
                    Relative to runMin
                </data>
             </if>
             <data type="int" name="eventNumber">
                Event number, or -1 for run header records
             </data>
             <if condition="(controlWord&amp;2)==1">
                <data type="long" name="locationOffset">
                    Relative to baseOffset
                </data>
             <else/>
                <data type="int" name="locationOffset">
                    Relative to baseOffset
                </data>
             </if>
         </repeat>
     </block>
  </record>