code: @Override
      public InputSource resolveEntity(String publicId, String systemId) {
          logger.debug("resolveEntity(publicId={}, systemId={}) - start", publicId, systemId);
  
          // No DTD metadata wanted/available
          if (_dtdHandler == null || !_dtdHandler.isDtdPresent()) {
              return new InputSource(new StringReader(""));
          }
          return null;
      }
docs: EntityResolver interface