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

[Asmus Freytag]

On 5/6/2024 7:23 PM, Erik Carvalhal Miller via Unicode wrote:
> If emoji tag sequences, including the existing flag emoji tag 
> sequences, categorically constitute markup, then this markup format is 
> one which Unicode has paradoxically defined as part of its plain‐text 
> standard. 

And that is the key. If you agree that Unicode is a plain text standard 
then anything that Unicode defines is ipso-facto plain text.

You may choose to go "plainer" by not supporting some features of 
Unicode (and the conformance clauses make provisions for that).

But you may not extend Unicode with additional features without leaving 
the definition of plain text.

That may seem paradoxical, but that's what it is.

A./
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