Index sections within entries

Capture index sections within entries in the section element with attribute role="index".

e/section[@role="index"]


      <section id="omo-9780333608005-e-40023-section-2" role="index">
        <indexGroup id="omo-9780333608005-e-40023-indexGroup-1"><indexList id="omo-9780333608005-e-40023-indexList-1" indexListType="other">
 <alphabet/>
 <indexItem1>
   <iHeadword>Bach, Carl Philipp Emanuel</iHeadword>
   <xrefGrp>
     <xref ref="omo-9780333608005-e-40023-div2-2" type="2">§III (9)</xref>
   </xrefGrp>
 </indexItem1>
 <indexItem1>
   <iHeadword>Bach, Johann Sebastian</iHeadword>
   <xrefGrp>
     <xref ref="omo-9780333608005-e-40023-div2-1" type="2">§III (7)</xref>
   </xrefGrp>
 </indexItem1>
 <alphabet/>
 <indexItem1>
   <iHeadword>Cöthen</iHeadword>
   <xrefGrp>
     <xref ref="omo-9780333608005-e-40023-div3-3" type="2">§III (7) 6.</xref>
   </xrefGrp>
 </indexItem1></indexList>
        </indexGroup>
      </section>