Some additional information to what Ken wrote, (and I concur with what
I think Mark is trying to do this work for XML and XML refers to
10646 as its normative document, so for that sake Mark should
refer the 10646 rules which are a little different from Unicode.
First of all 10646 has a 31-bit codespace. I know that there are
proposals to change that to only rferring to plane 0 thru 16, but that
is not approved yet, although it would probably succeed.
Second, the control characters U0000..U001F U007F..U009F are also
(abstract) characters, but alas, (abstract) control characters.
Third, U0000..U001F U007F are included in 10646 by normative
reference to ISO/IEC 6429, and I claim that
the C1 range is included too (U0080..U009F) but some dispute this.
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