public static function isValid(&$properties_dictionary, $limit_to_keys, &$error)
 {
     //	Check each property is valid
     //
     if (!parent::isValid($properties_dictionary, $limit_to_keys, $error)) {
         return false;
     }
     if (ValidationC::should_test_property(EVENT_SPACE_TIME_OCCURRENCE_RELATIONSHIP_NAME_RANGE, $properties_dictionary, false, $limit_to_keys) && !Range::isValid($properties_dictionary[EVENT_SPACE_TIME_OCCURRENCE_RELATIONSHIP_NAME_RANGE], $limit_to_keys, $error)) {
         //	Attendees range was not valid
         //
         return false;
     }
     return true;
 }