<workbook>
  <worksheet>
    <loop name="data">
      <row>
        <if name="highlight_this">
          <format bgcolor="purple">
            <cell><var name="something" /></cell>
          </format>
        </if>
        <if name="highlight_this" is="false">
          <cell><var name="something" /></cell>
        </if>
      </row>
    </loop>
  </worksheet>
</workbook>
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