om/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink"><code>ConcurrentHashMap</code></a> which indexes <a href="../../index/compound/support/CompoundAttribute.html" title="class in com.googlecode.cqengine.index.compound.support"><code>CompoundAttribute</code></a>s,
 storing <a href="../../index/compound/support/CompoundValueTuple.html" title="class in com.googlecode.cqengine.index.compound.support"><code>Com