Charmod: Characters above U+10FFFF

Hi,

   Section 3.5 of [CHARMOD] reads:

[...]
  The specification MUST NOT arbitrarily restrict the range of
  characters that can be used, which must cover all Unicode code points
  from 0 to 0x10FFFF inclusive. 
[...]

This leaves out whether specifications should avoid allowing
"characters" beyond this range (e.g. allowing 0 to 0xFFFFFFFF). I think
the recommendation should state, that specifications should restrict the
range of valid "characters" to the characters allowed by Unicode.

[CHARMOD] - http://www.w3.org/TR/2001/WD-charmod-20010126
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