code: function elt_label($eltid)
  	{
  		switch($eltid) {
  			case _ETS_ROOT:         return 'root element';
  			case _ETS_TEXT:         return 'text element';
  			case _ETS_TAG:          return 'simple tag element';
  			case _ETS_ALT_TAG:      return 'alternate tag element';
  			case _ETS_TEMPLATE:     return 'template element';
  			case _ETS_SET:          return 'set element';
  			case _ETS_SETVAL:       return 'set-value element';
  			case _ETS_MIS:          return 'missing element';
  			case _ETS_MISVAL:       return 'missing-value element';
  			case _ETS_PHP:          return 'PHP element';
  			case _ETS_CONST:        return 'constant element';
  			case _ETS_IF:           return 'if element';
  			case _ETS_CODE:         return 'PHP code or test';
  			case _ETS_CHOOSE:       return 'choose element';
  			case _ETS_WHENTEST:     return 'when-test element';
  			case _ETS_ELSE:         return 'else element';
  			case _ETS_CHOOSEVAR:    return 'choose-variable element';
  			case _ETS_WHENVAL:      return 'when-value element';
  			case _ETS_CALL:         return 'call element';
  			case _ETS_ARG:          return 'argument element';
  			case _ETS_MIS_TEMPLATE: return 'missing template element';
  			case _ETS_REDUCE:       return 'reduce element';
  			case _ETS_REPEAT:       return 'repeat element';
  			case _ETS_RSS:			return 'rss element';
  			case _ETS_INCLUDE:      return 'include element';
  			case _ETS_INSERT:       return 'insert element';
  			case _ETS_EVAL:         return 'eval element';
  			case _ETS_SAFE:         return 'safe eval element';
  			case _ETS_ROOT_EVAL:    return 'eval or safe element';
  			case _ETS_PLACE:    	return 'place element';
  		}
  	}
docs: Define the label of a element type from an id