Thanks for all comments! For now I created 
https://wiki.openstreetmap.org/wiki/Tag:amenity%3Duniversity#Complex_areas
to document complexity discovered during this discussion.

This way we can avoid remaking entire discussion next time and problem is at 
least documented.

Feb 6, 2020, 11:34 by vosc...@gmail.com:

> Sorry, Martin, but what do you do, if you have a big multi-storey building 
> and all you have is the door bell on the street level? Not map it?
> The Tuebingen example illustrates the problem. The relation has two nodes in 
> a multipolygon as outer? That is not kosher either.
> Volker
>
> On Thu, 6 Feb 2020 at 11:21, Martin Koppenhoefer <> dieterdre...@gmail.com> > 
> wrote:
>
>>
>>
>> Am Do., 6. Feb. 2020 um 11:01 Uhr schrieb Volker Schmidt <>> 
>> vosc...@gmail.com>> >:
>>
>>> Padua, Italy, where I live, has a big university spread all over the place. 
>>> This includes smaller sections being in apartments in buildings that are 
>>> mainly used residentially. 
>>>
>>
>>
>> yes, I am also well familiar with universities spread over many different 
>> buildings (or sometimes just a floor of a building although I have not yet 
>> seen an apartment used (for what? Office? lecture room? Probably not as a 
>> lecture hall, would not be suitable)).
>>
>> Common way to map this (unfortunately) is amenity=university on all parts, 
>> e.g. 
>> https://www.openstreetmap.org/way/25074981
>>
>> Here's an example of a (not yet complete and in some parts overcomplete) 
>> multipolygon for the Universität Tübingen: >> 
>> https://www.openstreetmap.org/relation/8639592
>> (curiously, there are also node members ;-) ).
>>
>>  
>>
>>>
>>> With other words "pieces" of the University come in all sizes and shapes, 
>>> from what would be a typical campus to single apartments, where the 
>>> "location" is the building entrance where the university institution is 
>>> only one of many door bells.
>>> And I know that this is true of other universities and research 
>>> establishments. 
>>> This situation made me think of (mis-)using the site relation for tagging.
>>>
>>>
>>
>>
>> yes, but if we keep the small places like the apartment as nodes, it will 
>> not be possible to see that they are small, because a node can be any kind 
>> of size.
>>
>>
>> Cheers,
>> Martin
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>>

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