Hi! Sorry for delay (didn't notice).

I thought that the only usage of colon is language subgroup. My gut intention was to use colon (pun) but I was afraid to break something :)

In Belarus we use Cyrillic script. In 2007 we got legal specification for transcription of Belarusian Cyrillic to Belarusian Latin in geonames. Later this specs were approved by UN as the recommended ones.

But in 2023 our government decided to fight with diacritic signs and 'Polish influence' from political reasons. We got new specification.

But the first one from 2007 is still recognized by international community as sole one.

So I wrote small Mac app for myself to convert using both rules and I used it for PT.

If the colon is more proper in this case I'll change it.

Thank you for you attention! Looking forward for advice