code: public void startElement (String uri, String localName, String qName,
                    Attributes atts)
      throws SAXException
      {
      if (contentHandler != null) {
          contentHandler.startElement(uri, localName, qName, atts);
      }
      }
docs: Filter a start element event.
  
  @param uri The element's Namespace URI, or the empty string.
  @param localName The element's local name, or the empty string.
  @param qName The element's qualified (prefixed) name, or the empty
  string.
  @param atts The element's attributes.
  @exception org.xml.sax.SAXException The client may throw
  an exception during processing.