root/galaxy-central/lib/galaxy/datatypes/indexers/interval.xml

<tool id="INDEXER_Interval_0" name="Index Interval for Track Viewer">
  <!-- Used internally to generate track indexes -->
  <command interpreter="python">interval.py $input_dataset 
    -1 ${input_dataset.metadata.chromCol},${input_dataset.metadata.startCol},${input_dataset.metadata.endCol},${input_dataset.metadata.strandCol}
    $store_path 2&gt;&amp;1
  </command>
  <inputs>
    <page>
      <param format="interval" name="input_dataset" type="data" label="Choose intervals"/>
    </page>
   </inputs>
  <help>
  </help>
</tool>