In one embodiment, the map instance 134 is {HEAD ~ a runtime instantiation} of {TAIL ~ the map definition} 132 
In one embodiment , the map instance 134 is { HEAD ~ a runtime instantiation } of { TAIL ~ the map definition } 132
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH