Use of tag characters in a private encoding - is it valid please?

[William_J_G Overington]

For this research let us use U+10FFFD as the base character, and based 
on
 
 
https://www.unicode.org/charts/PDF/UE0000.pdf 
<https://www.unicode.org/charts/PDF/UE0000.pdf>
 
 
for this research let us define U+F7020 through to U+F707F as RESEARCH 
TAG characters, such that, as examples,
 
 
U+F7020 RESEARCH TAG SPACE
 
 
U+F7021 RESEARCH TAG EXCLAMATION MARK
 
 
and
 
 
U+F707F RESEARCH CANCEL TAG
 
 
Placing the research tags in Plane 15 is so that any software written 
will be more easily converted to using Plane 14 tag code points if the 
research is successful and leads to a regular Unicode encoding.
 
 
The choice of the F7 range rather than the F0 range is so that the code 
point for a RESEARCH TAG is more than 1 bit different from the code 
point of a TAG.
 
 
William Overington
 
 
Wednesday 8 May 2024
 
 
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