protected void processEntity(StdXMLReader         reader,
                                XMLEntityResolver entityResolver)
      throws Exception
   {
      if (! XMLUtil.checkLiteral(reader, "NTITY")) {
         XMLUtil.skipTag(reader);
         return;
      }

      XMLUtil.skipWhitespace(reader, null);
      char ch = XMLUtil.readChar(reader, '\0');

      if (ch == '%') {
         XMLUtil.skipWhitespace(reader, null);
         entityResolver = this.parameterEntityResolver;
      } else {
         reader.unread(ch);
      }

      String key = XMLUtil.scanIdentifier(reader);
      XMLUtil.skipWhitespace(reader, null);
      ch = XMLUtil.readChar(reader, '%');
      String systemID = null;
      String publicID = null;

      switch (ch) {
         case 'P':
            if (! XMLUtil.checkLiteral(reader, "UBLIC")) {
               XMLUtil.skipTag(reader);
               return;
            }

            XMLUtil.skipWhitespace(reader, null);
            publicID = XMLUtil.scanString(reader, '%',
                                          this.parameterEntityResolver);
            XMLUtil.skipWhitespace(reader, null);
            systemID = XMLUtil.scanString(reader, '%',
                                          this.parameterEntityResolver);
            XMLUtil.skipWhitespace(reader, null);
            XMLUtil.readChar(reader, '%');
            break;

         case 'S':
            if (! XMLUtil.checkLiteral(reader, "YSTEM")) {
               XMLUtil.skipTag(reader);
               return;
            }

            XMLUtil.skipWhitespace(reader, null);
            systemID = XMLUtil.scanString(reader, '%',
                                          this.parameterEntityResolver);
            XMLUtil.skipWhitespace(reader, null);
            XMLUtil.readChar(reader, '%');
            break;

         case '"':
         case '\'':
            reader.unread(ch);
            String value = XMLUtil.scanString(reader, '%',
                                              this.parameterEntityResolver);
            entityResolver.addInternalEntity(key, value);
            XMLUtil.skipWhitespace(reader, null);
            XMLUtil.readChar(reader, '%');
            break;

         default:
            XMLUtil.skipTag(reader);
      }

      if (systemID != null) {
         entityResolver.addExternalEntity(key, publicID, systemID);
      }
   }