tic targets." href="../../Null.html">Null</a>&lt;<a class="type" title="nb.ds.NamedData - Contains a value (data) paired with a string (name)." href="../../nb/ds/NamedData.html">NamedData</a>&lt;<span class="type">T</span>&gt;&gt;</code></h3><div class="doc"><p>Unmaps the <code><a href="../../nb/ds/NamedData.html#NamedData">NamedData</a>&lt;T&gt;</code> mapped to <code>oldKey</code> and maps it to <code>newKey</code>. <code>newKey</code> shouldn't be already mapped.</p><p class="javadoc">Parameters:</p><tab