Thanks for replying (both of you)
For what it’s worth, the dots (full-stops) have hex value 0 (null)
But it looks like I am not clear about what I am trying to understand.
I don’t care if it are dots, symbols, or numbers as limiters between the tags.
What I am wondering about is why there are differences in the delimiters between e.g. performers.
As I said before, some have just four dots, but other have an exclamation mark with three dots, or a plus sign and three dots, or a hyphen and three dots, etc. etc.
I am wondering if that has some relevance that might be reflected in tagging programs such as Picard.
I am not able to deduct any pattern with these delimiters here.