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