' section's reader key. Section is a top level key, 'xmp', 'iptc', etc. Key is a key in the section dictionary.</p>
<pre class="listing"><span class="Keyword">import</span> <span class="Identifier">metar</span>
<span class="Identifier">echo</span> <span class="Identifier">keyName</span><span class="Punctuation">(</span><span class="StringLit">&quot;dng&quot;</span><span class="Punctuation">,</span> <span class="StringLit">&quot;exif&quot;</span><span class="Punctuation">,</span> <span class="StringLit">&quo