[Tagging] Features underwater (inside reservoirs)

[Lanxana .]

Hi everyone!

We have been looking for how to tag the ruins of constructions (buildings,
bridges or roads) that are inside some reservoirs. Although they generally
remain underwater, but in times of drought, when the reservoir level drops
low enough, they can be visited on foot.  Like this [1]

On first time, the combination historic=ruins + building=yes (or whatever
corresponds) identifies that it’s a historical feature, it’s in ruins
and/or it isn’t habitable. But how to indicate that it’s underwater
partially or totally and its access is occasionally possible, when the
water drops?

I find these tags, but none convinces me:

Historic=wreck [2] -> only for nautical elements

Location=underwater [3] -> it seems that it’s appropriate but the
description tells “installed between a water surface and the floor
beneath”, it isn’t the case…

Flood_prone=yes [4] -> advices from a hazard, it isn’t the case…

Is there any more that I haven’t seen?

Thanks!

[1]
https://commons.wikimedia.org/wiki/Category:Church_of_Sant_Rom%C3%A0#/media/File:Esgl%C3%A9sia_de_Sant_Rom%C3%A0_de_Sau.jpg

[2] https://wiki.openstreetmap.org/wiki/Tag:historic%3Dwreck

[3] https://wiki.openstreetmap.org/wiki/Tag:location%3Dunderwater

[4] https://wiki.openstreetmap.org/wiki/Key:flood_prone
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[Tagging] Multiple values in isced:level

[Lanxana .]

Hi!
I would like to know how to indicate that a school offers several
educational levels. I've been seeing the isced: level tag, which is that I
think to use, but I have a question about how to separate multiple values.

I have looked in taginfo and approximately in 15000 cases the semicolon (;)
is used, in 3000 the comma (,) and in 1000 cases the hyphen (-). It would
seem therefore that the general criteria is to use the semicolon.

It really is that? Is there no risk of causing errors when converting data
to another format?

Another option that I had valued, and of which I have not found use, is to
add the level in the label itself, thus being:

isced: level: 1 = yes + isced: level: 2 = yes, for a center that offers
levels 1 and 2.

What's your opinion?

Thanks!
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