> On 13 Feb 2020, at 16:41, wjgo_10...@btinternet.com via Unicode 
> <unicode@unicode.org> wrote:
> Yet a Private Use Area encoding at a particular code point is not unique. 
> Thus, except with care amongst people who are aware of the particular 
> encoding, there is no interoperability, such as with regular Unicode encoded 
> characters.
> However faced with a need for interoperability for my research project, I 
> have found a solution making use of the Glyph Substitution capability of an 
> OpenType font.
> The solution is to invent my own encoding space. This sits on top of Unicode, 
> could be (perhaps?) called markup, but it works!

It may be perilous, because some software may enforce the strict official code 
point limits.

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