opment of a meaningful DTD grammar caching/preparsing
 framework, this functionality has been moved into the XMLDTDLoader
 class.  Therefore, this class no longer implements the DTDFilter
 or DTDContentModelFilter interfaces.
 <p>
 This component requires the following features and properties from the
 component manager that uses it:
 <ul>
  <li>http://xml.org/sax/features/namespaces</li>
  <li>http://xml.org/sax/features/validation</li>
  <li>http://apache.org/xml/features/validation/dynamic</li>
  <li>htt