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