Header file 900 is {HEAD ~ an example} of {TAIL ~ an implementation} of header file 304 in FIG 3 
of
Header file 900 is { HEAD ~ an example } of { TAIL ~ an implementation } of header file 304 in FIG 3
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH