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