{{Support for Apache's mod_expires}} extern type mime_type; extern type interval_base; extern val access : interval_base; extern val modification : interval_base; extern type interval; extern val years : interval; extern val months : interval; extern val weeks : interval; extern val days : interval; extern val hours : interval; extern val minutes : interval; extern val seconds : interval; extern val expiresByType : mime_type -> interval_base -> int -> interval -> [^Vhost]; {{See Apache documentation.}}