The interface is configured to provide {TAIL ~ access} to the data elements and the order keys in {HEAD ~ the dataset} in a type safe manner 
The interface is configured to provide { TAIL ~ access } to the data elements and the order keys in { HEAD ~ the dataset } in a type safe manner
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH