en the target collection is a <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util"><code>java.util.Map</code></a>, the <code>cascade</code> element applies to the
 map value.

 <p> Defaults to no operations being cascaded.</div>
<dl>
<dt>Default:</dt>
<dd>{}</dd>
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<h4>fetch</h4>
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