May be the PUA allocated spaces could be divided in normative categories, for example by assigning LTR or RTL base letters in some areas, diacritics in another large area splitted in 255 subspaces for combining characters, and symbols or ideographs in another large area.
Um, then it wouldn't be private. I seem to remember a recent discussion of how Microsoft doing something similar was causing all kinds of difficulty.
-- Curtis Clark http://www.csupomona.edu/~jcclark/ Mockingbird Font Works http://www.mockfont.com/
