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      <h1>Extension attributes (XSLT only)</h1>
      <p>An extension attribute is an extra attribute on an XSLT-defined element. These attributes are all in
the Saxon namespace <code>http://saxon.sf.net/</code>. This namespace needs to be declared in a namespace declaration,
but it does not need to be listed in the <code>extension-element-prefixes</code> attribute.</p>
      <p>For example, the <code>saxon:assignable</code> attribute can be set as follows:</p>
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            <code>&lt;xsl:variable name="counter" saxon:assignable="yes" 
    xmlns:saxon="http://saxon.sf.net/"&gt;
</code>
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      <p>The extension attributes provided with the Saxon product are as follows:</p>
      <ul>
         <li>
            <p><a class="bodylink" href="attributes/assignable.xml">saxon:assignable</a>: marks a variable as updateable</p>
         </li>
         <li>
            <p><a class="bodylink" href="attributes/explain.xml">saxon:explain</a>: requests display of optimized expression tree</p>
         </li>
         <li>
            <p><a class="bodylink" href="attributes/memo-function.xml">saxon:memo-function</a>: marks a function as a memo function</p>
         </li>
         <li>
            <p><a class="bodylink" href="attributes/read-once.xml">saxon:read-once</a>: enables serial processing of source documents</p>
         </li>
         <li>
            <p><a class="bodylink" href="attributes/threads.xml">saxon:threads</a>: enables parallel processing of xsl:for-each instructions</p>
         </li>
      </ul>
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