vice is the the "provider" attribute, or it one wants to
  specify a number of classes that implement the service, by
  "provider" nested elements.
</p>
<p>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">type</td>
    <td valign="top">The name of the service.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
  