An advantage of the present invention is that {HEAD ~ a complete set} of {TAIL ~ tracking records} for a package hierarchy, such as a pallet of boxes, where each box contains a number of packages etc., can be obtained in one single trace 
of
An advantage of the present invention is that { HEAD ~ a complete set } of { TAIL ~ tracking records } for a package hierarchy , such as a pallet of boxes , where each box contains a number of packages etc . , can be obtained in one single trace
OTH OTH OTH OTH OTH OTH OTH OTH HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH