{HEAD ~ The data} encoded by {TAIL ~ each tag} includes an identity of the product item, an identity of the interface surface and the position of the respective tag on the interface surface 
encoded by
{ HEAD ~ The data } encoded by { TAIL ~ each tag } includes an identity of the product item , an identity of the interface surface and the position of the respective tag on the interface surface
HEAD HEAD HEAD HEAD HEAD HEAD REL 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