[OSM-legal-talk] Is an object created by a non-agreer always tainted, even if all info has been deleted/changed by agreers?

[Spod]

OK, so spelling corrections could be viewed as not removing the taint,
because we can't tell if the agreer making the change used a
odbl/CT-compatible source for the change or not.

Thinking about it, other edits done by "bots" to normalise the tagging into
a "standard" (e.g. changing something like leisure=swimming_pool into
sport=swimming [that's a made-up example off the top of my head!]), could
also be viewed as not removing the taint, because we also can't tell if the
agreer used an odbl/CT-compatible source or not.

However, we could add something to the taint checking that would ignore the
taint of specific tags if changes of specific tag values from one "official"
value to another "official" value had been made. 
It seems that it is quite difficult to imagine all of the different
scenarios though, so it sounds as if such tests would need to be very
specific (e.g. 'A change of the highway tag from one official value to
another official value, removes the taint from that tag). 
There are probably other specific tags, for which we could define similar
specific changes which would remove the tag. 
Maybe for the name tag, the taint checking could check to see if the new
value is just a spelling variation or a completely different value (using
some kind of fuzzy string matching?) - with a completely different value
resulting in the taint being removed from that tag?

It's obviously a bit more complicated than it first appears, but I think
that there must be some additions that could be made to the taint checking
to remove the taint in specific, well-defined situations, which would
hopefully reduce the amount of supposedly-tainted data a bit (how much. I'm
not sure).



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