Handle India/Bangladesh boundaries

[blaenk]

See: osm-without-borders/cosmogony#115

I'm cross-posting here because I think it is relevant to this project specifically, posted there to bring it to their attention as well.

I realized that in Cosmogony ZoneType=Country zones were missing for India and Bangladesh. In fact, it seems much more is missing, possibly because the larger country boundary is missing?

I'm reporting this not as a matter of pedantic precision but with the intention to alert you that it seems this entire area (India/Bangladesh) is missing.

Note however that the flanking islands are present:

For Bangladesh, the only part that is present is this little chunk (osm id: relation:3921211, specifically this chunk, name: রংপুর বিভাগ). Interestingly, I think it is precisely one of those enclaves (not sure)

I think it may be related to many enclaves being present between India and Bangladesh. See this wikipedia article, in fact there are even counter-counter enclaves, see this diagram on wikipedia:

The interesting thing is that southern Netherlands at the border with Belgium there are some enclaves as well but those seem to be handled fine (Yellow is the Netherlands and green is Belgium). Maybe it has to do with there being counter and counter-counter enclaves in India/Bangladesh? Wikipedia seems to claim they both create the only counter-counter enclave in the world.

I think this is just not supported right now?

https://github.com/Qwant/osm_boundaries_utils_rs/blob/master/src/boundaries.rs#L143-L144

I did notice that for example has a role of subarea within Bangladesh, and subarea is not in the list of roles to extract here, might it be as simple as adding it?