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

[Ken Whistler]

On 4/26/2024 4:00 PM, William_J_G Overington via Unicode wrote:
>
> May I ask please, Is it valid to use a sequence of tag characters 
> ending in a cancel tag in a private use encoding of characters if the 
> base character of the sequence is a Private Use Area character?
>
Of course. Just do not expect to be able to interchange your intent 
reliably, unless you get widespread public agreement about your use both 
of the PUA characters and your conventions for use of the tag 
characters. Otherwise, it is likely the person you communicate with will 
just see: *□□□□□□□□□□□□□□□*

As an example, I would be perfectly within my rights to try to convey 
today's date, April 26, 2024 with the following Unicode string:

òóòòòòòòò òòòòòòòòò òóòòòòòòò òòòóòòòòò òòòòòòòòò òòòóòòòòò òòóòòòòòò 
òòòòòóòòò

Perfectly conformant to the Unicode Standard. However, I expect that I 
would have difficulty convincing other people to use that convention to 
interchange dates, instead of the string "April 26, 2024" or 
"2024-04-26" or some similar, already established convention for the 
formatting of dates. On the bright side, at least they wouldn't be 
seeing a string of uninterpretable character boxes. ;-)

--Ken
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