public void closeTag(){
  String tag=openTags.pop();
  indent.setLength(indent.length() - INDENT_STR.length());
  writer.println(indent + "</" + tag+ ">");
}

public void closeTag ( ) { String tag = openTags . pop ( ) ; indent . setLength ( indent . length ( ) - INDENT_STR . length ( ) ) ; writer . println ( indent + "</" + tag + ">" ) ; }
closes the corresponding xml tag
