These aspects of the invention make it possible to change {HEAD ~ implementation} at {TAIL ~ deployment time}, as opposed to compile time 
at
These aspects of the invention make it possible to change { HEAD ~ implementation } at { TAIL ~ deployment time } , as opposed to compile time
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH