lucene/queryparser/src/test/org/apache/lucene/queryparser/xml/NestedBooleanQuery.xml

<?xml version="1.0" encoding="UTF-8"?>
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<!--
  This query was added to demonstrate nested boolean queries - there
  was a bug in the XML parser which added ALL child <Clause> tags to 
  the top level tags ie. took child and grandchild elements instead
  of just child elements. This was due to the use of the 
  Element.getElementsByTagName() call in BooleanQueryBuilder
-->  
<BooleanQuery fieldName="contents">  
  <Clause occurs="should">
    <BooleanQuery fieldName="contents">
      <Clause occurs="must">
        <TermQuery>doesNotExistButShouldBeOKBecauseOtherClauseExists</TermQuery>
      </Clause>
    </BooleanQuery>
  </Clause>
  <Clause occurs="should">
    <TermQuery>bank</TermQuery>
  </Clause>
</BooleanQuery>