 We denote by formula_2 the Borel subsets of formula_1.Let formula_4 be the space of right continuous maps from formula_5 to formula_1 that have left limits in formula_1,
and for each formula_8, denote by formula_9 the coordinate map at formula_10; for
each formula_11, formula_12 is the value of formula_13 at formula_10.We denote the universal completion of formula_2 by formula_16.