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    <h1>Metadata reference tables</h1>
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<div><h2>Metadata Working Group Keywords schema</h2></div>
<p>The Metadata Working Group's schema for hierarchical keywords metadata.
 <ul>
  <li>Exiv2 keys are nested in the form <code>Xmp.mwg-kw.Keywords/mwg-kw:Hierarchy/mwg-kw:&lt;Property&gt;</code></li>
  <li>The schema namespace URI is <code>http://www.metadataworkinggroup.com/schemas/keywords/</code></li>
  <li>The preferred schema namespace prefix is <code>mwg-kw</code></li>
 </ul>
Reference: <a href="http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf" title="Guidelines for Handling Image Metadata">Guidelines for Handling Image Metadata</a></p>


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