public static function clearCaches()
{
self::$s_prefetch_cache = array();
self::$s_instance_cache = array();
self::$s_timestamp_cache = array();
self::$s_rel_prefetch_cache = array();
self::$s_parsed_field_component_cache = array();
self::$opa_hierarchy_parent_prefetch_cache = array();
self::$opa_hierarchy_children_prefetch_cache = array();
self::$opa_hierarchy_parent_prefetch_cache_index = array();
self::$opa_hierarchy_children_prefetch_cache_index = array();
self::$opa_hierarchy_siblings_prefetch_cache = array();
self::$opa_hierarchy_siblings_prefetch_cache_index = array();
self::$s_template_prefetch_cache = array();
}