 for notifications of a change in value of a <a href="MapField.html" title="class in io.permazen.core"><code>MapField</code></a>.</div>
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<div class="col-first even-row-color"><a href="class-use/MapKeyIndex.html#io.permazen.core">MapKeyIndex</a></div>
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<div class="block">An index on the keys of a map field.</div>
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<div class="col-first odd-row-color"><a href="class-use/MapValueIndex.html#io.permazen.core">MapValueIndex</a></div>
<div class="col-last odd-row-co