public static function __static()
	{
		InstanceFactsIterator::$itemSubstitutionGroup = array( \XBRL_Constants::$xbrliItem );
		InstanceFactsIterator::$tupleSubstitutionGroup = array( \XBRL_Constants::$xbrliTuple );
		InstanceFactsIterator::$nodeTest = XmlQualifiedNameTest::create( "substitutionGroup" );
	}