[Tagging] Feature Proposal - RFC - Tax free shopping

[Hauke Stieler]

> if you dislike duty_free=limited, maybe duty_free=refund
> is more understandable

I had the idea of "duty_free=<yes|no|refund>" before, but it changed to
the current scheme with "duty_free:refund=*" during the discussion.

However, I can definitely imagine going back to
"duty_free=<yes|no|refund>" with the additional tags
"duty_free:refund:*=*" like this:

	duty_free=refund
	duty_free:refund:global_blue=yes
	duty_free:refund:gb_free_taxes=no
	...

This also makes sense as there are four combinations of "duty_free=" and
"duty_free:refund=" where one combination doesn't make sense
(duty_free=no with duty_free:refund=yes).

I'll wait a bit for further discussion about this and then may change
the wiki.

Hauke

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