a data pattern enforcer for applying {HEAD ~ said rules} to {TAIL ~ packets} at the adaptor layer; and 
to
a data pattern enforcer for applying { HEAD ~ said rules } to { TAIL ~ packets } at the adaptor layer ; and
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH