James Kass wrote as follows.
quote
For non-BMP, how about a double tall glyph at the left as the
plane signifier? (All 6 digits aren't really needed.) To try to
illustrate this in plain text will use box drawing glyphs to
simulate a Plane One glyph for U+11234:
╷12
╵34
end quote
I like the double tall glyph with the hexadecimal digits in the order that
one reads them in an English book. Almost like a minipage with an
illuminated capital! :-)
It occurs to me that using the double tall glyph at the left might be a good
idea for all planes, including plane 0. This would mean that where several
unknown characters in a sequence were received that the hexadecimal
representations of each of the characters would be clearly distinguished one
from another, thereby avoiding an analyst having to make a hardcopy print
out and then draw in by hand red vertical lines so as to make clear which
hexadecimal characters are grouped together, for, if, say, a sequence of
twenty unknown-by-the-font characters were received it might not be
otherwise obvious which particular sets of four hexadecimal characters
belonged to which unknown-by-the-font Unicode character.
I wonder if the double tall glyph at the left could have any one of the
seventeen possible values 0 1 2 3 4 5 6 7 8 9 0 A B C D E F G so as to
indicate the plane, with G being used so as to avoid having to have 10
crammed into a narrow horizontal space. Or maybe there is a better choice
of such a single character than using G, perhaps using U so as to indicate
"Unicode plane hexadecimal 10".
William Overington
23 August 2002
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