tests/conf/predicate/predicate16.xml

<?xml version="1.0"?> 
<doc>
  <a squish="heavy" squash="butternut">1</a>
  <a squish="heavy" squeesh="virus">2</a>
  <a squash="butternut" squeesh="virus">3</a>
  <a squish="heavy">4</a>
  <a squeesh="virus">5</a>
  <a squash="butternut">6</a>
</doc>