function _define_attributes_definition()
	{
		return complex_array :: array_merge(
				parent :: _define_attributes_definition(),
				array(
				'identifier' => array('search' => false)
				));
	}
	function _define_attributes_definition()
	{
		return complex_array :: array_merge(
				parent :: _define_attributes_definition(),
				array(
				'content' => array('search' => true, 'search_weight' => 1),
				'annotation' => array('search' => true, 'search_weight' => 5),
				'identifier' => array('search' => false)								
				));
	}
 function period_news_object()
 {
     parent::period_object();
 }
 function announce_object()
 {
     parent::period_object();
 }