ion</span><span class="Other">:</span> <span class="Identifier">string</span><span class="Other">;</span> <span class="Identifier">key</span><span class="Other">:</span> <span class="Identifier">string</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">string</span></pre></dt>
<dd>
<p>Return the name of the key for the given section of metadata or &quot;&quot; when not known.</p>
<p>readerName is the name of the reader, 'jpeg', 'dng', etc. You can get this from the 'meta