An interface to {HEAD ~ the dataset} is generated that is parameterized by an element type parameter and {TAIL ~ a key type parameter} 
An interface to { HEAD ~ the dataset } is generated that is parameterized by an element type parameter and { TAIL ~ a key type parameter }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL