<tr>
    <td valign="top">provider</td>
    <td valign="top">
      The classname of the class implementing the service.
    </td>
    <td valign="top" align="center">Yes, unless there is a nested
      <code>&lt;provider&gt;</code> element.</td>
  </tr>
</table>
  <p>
    The provider classname is specified either by the "provider" attribute, or
    by a nested &lt;provider&gt; element, which has a single "classname" attribute.
    If a JAR file has more that one implementation of the service, a number of
