code: public MIMETypedStream getMethodsXML(Context context,
                                                   String PID,
                                                   String sDefPID,
                                                   Date asOfDateTime)
              throws ServerException {
          return null;
      }
docs: Get an XML encoding of the service defintions for a given dynamic
  disseminator that is associated with the digital object. The dynamic
  disseminator is identified by the sDefPID.
  
  @param context
  @param PID
  identifier of digital object being reflected upon
  @param sDefPID
  identifier of dynamic Service Definition
  @param asOfDateTime
  @return MIME-typed stream containing XML-encoded method definitions
  @throws ServerException