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

[Asmus Freytag]

On 4/29/2024 11:06 AM, William_J_G Overington via Unicode wrote:
> the phrase "private agreement" in The Unicode Standard...

...is deliberately unconstrained.

If you tell a buddy that you included some unusual private use 
characters in a document and where he can get the font to display them, 
and he does so, then you and he have exercised a "private agreement".

If another friend tries to view the document without the font, or with a 
different font, and doesn't see what she expects, it does not in any way 
affect the claim of her font, software or platform to be conformant to 
the Unicode Standard.

That's all this ever means.

A./

PS: you are free to solicit other parties to join such private 
agreements and you may even choose to write them down. However, it's up 
to you to resolve any issues due to non-compliance with your private 
agreements. Unicode doesn't care -- as long as you don't agree to things 
that conflict with conformance to the Standard. In which case, such any 
conformance by participants in your agreement may no longer be valid.

PPS: the mathematical single angle brackets had to be added to correct a 
mistaken canonical unification. The name without "mathematical" was 
already used for characters that are now deprecated.
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