Hi Andrew,
+1 to add this piece of information on the wiki to focus efforts where they
would really be useful (where boundaries are not properly mapped)
This tag looks like a scaffold : when works are done, let it go !
All the best
François
Le 23 août 2016 11:58 PM, "Andrew Hain"
A detailed explanation of when Nominatim uses the is_in tag was recently posted
to the talk mailing list
[https://lists.openstreetmap.org/pipermail/talk/2016-August/076596.html]; it
only does so for certain objects and only when boundaries haven’t been mapped
properly.
It may therefore be