{HEAD ~ A dataset} including {TAIL ~ data elements} and order keys for indicating an ordering of the data elements is stored 
{ HEAD ~ A dataset } including { TAIL ~ data elements } and order keys for indicating an ordering of the data elements is stored
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH