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<title>Extension Type</title>
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<body>
<h2 id="fileset">Extension</h2>
<p>Utility type that represents either an available "Optional Package" (formerly known as "Standard
Extension") as described in the manifest of a JAR file, or the requirement for such an optional
package.</p>
<p>Note that this type works with extensions as defined by the "Optional Package" specification.
For more information about optional packages, see the document <em>Optional Package Versioning</em>
in the documentation bundle for your Java Standard Edition package, in
file <samp>guide/extensions/versioning.html</samp> or the
online <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/versioning/spec/versioning2.html#wp90779"
target="_top">Package Versioning documentation.</a></p>

<h3>Attributes</h3>
<p>The extension type supports the following attributes:</p>

<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>extensionName</td>
    <td>The name of extension</td>
    <td>yes</td>
  </tr>
  <tr>
    <td>specificationVersion</td>
    <td>The version of extension specification (must be in dewey decimal aka dotted decimal
      notation, eg <q>3.2.4</q>)</td>
    <td>no</td>
  </tr>
  <tr>
    <td>specificationVendor</td>
    <td>The specification vendor</td>
    <td>no</td>
  </tr>
  <tr>
    <td>implementationVersion</td>
    <td>The version of extension implementation (must be in dewey decimal aka dotted decimal
      notation, eg <q>3.2.4</q>)</td>
    <td>no</td>
  </tr>
  <tr>
    <td>implementationVendor</td>
    <td>The implementation vendor</td>
    <td>no</td>
  </tr>
  <tr>
    <td>implementationVendorId</td>
    <td>The implementation vendor ID</td>
    <td>no</td>
  </tr>
  <tr>
    <td>implementationURL</td>
    <td>The url from which to retrieve extension.</td>
    <td>no</td>
  </tr>
</table>

<h4>Examples</h4>
<pre>
&lt;extension id=&quot;e1&quot;
    extensionName=&quot;MyExtensions&quot;
    specificationVersion=&quot;1.0&quot;
    specificationVendor=&quot;Peter Donald&quot;
    implementationVendorID=&quot;vv&quot;
    implementationVendor=&quot;Apache&quot;
    implementationVersion=&quot;2.0&quot;
    implementationURL=&quot;https://somewhere.com/myExt.jar&quot;/&gt;
</pre>

<p>Fully specified extension object.</p>

<pre>
&lt;extension id=&quot;e1&quot;
    extensionName=&quot;MyExtensions&quot;
    specificationVersion=&quot;1.0&quot;
    specificationVendor=&quot;Peter Donald&quot;/&gt;
</pre>

<p>Extension object that just specifies the specification details.</p>

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