In this case, {TAIL ~ the file} includes {HEAD ~ content instances}, each content instance being associated with a respective field, and each field having a respective type 
In this case , { TAIL ~ the file } includes { HEAD ~ content instances } , each content instance being associated with a respective field , and each field having a respective type
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH