code: @Override
      public void startElement(String uri, String l, String q, Attributes a) {
          try {
              XDB.Element element = Enum.valueOf(XDB.Element.class, l.toUpperCase());
              switch (element) {
              case M:
                  break;
  
              case P:
                  _name = a.getValue("name");
                  break;
  
              case T:
                  _name = a.getValue("name");
                  _rindex = 0;
                  break;
  
              case H:
                  _data.clear();
                  _heading = null;
                  break;
  
              case R:
                  _cindex = 0;
                  break;
  
              case C:
                  break;
              }
          } catch (Exception x) {
              throw new RuntimeException("Failed to recognize element " + q, x);
          }
      }
docs: Receive notification of the start of an element.