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    <h1>Metadata reference tables</h1>
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<div><h2>PLUS License Data Format schema</h2></div>
<p>The PLUS License Data Format ("LDF") is an ordered group of fields available
   for optional use in embedding and reading image license metadata in digital
   files and other documents.</p>
 <ul>
  <li>Exiv2 keys are <code>Xmp.plus.&lt;Property&gt;</code></li>
  <li>The schema namespace URI is <code>http://ns.useplus.org/ldf/xmp/1.0/</code></li>
  <li>The preferred schema namespace prefix is <code>plus</code></li>
 </ul>
<p>Reference: <a href="http://ns.useplus.org/go.ashx" title="PLUS Technical Specification">PLUS Technical Specification</a></p>

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