Confusing format string

[Wolfgang]

I'm really sorry but it's impossible for me to see the logic in the format string grammar used in the tagFormat property:
What is the difference between:
Artist.displayFormat={$artist$orchestra}
and:
Title.displayFormat={$title^$date} ?

This is taken from your examples in the user guide. Why has the second string an '^' character between $title and $date?
You write that each occuring '^' character denotes the prefix, postfix and separator - in this order. How does this match with the format string Title.displayFormat={$title^$date}?

And what format string would I need to just append let's say an 'x' to the tag? It should be {$tag^^x}

greets,
Wolfgang