... for a 1: Slltakes care of recording values of a1 in [1 5], and S12 for values in [6 10 ].Likewise, server S 21 records values for a2 in range [10 1 15 0] and server S22 forvalues in [15 1 200]. ... defined the second to be the time ittakes the cesium 13 3 atom to make exactly 9 ,19 2,6 31, 770 transitions. The choiceof 9 ,19 2,6 31, 770 was made to make the atomic second equal to the mean solar second ... and a single server is assigned to each subrange. To explain, consider aresource description with two attributes: a 1 taking values in the range [1 10] and a2 taking values in the range [10 1...