@ubipo for indoor=level, I suppose you mean indoor=yes indoor=thenumber :)

building:part is for a part of a building where tag related to the 
building itself doesn't have the same value for one part <> another part
for exemple a building that have one part with one level :
building:part=yes
building:levels=1
and another part with 2 levels
building:part=yes
building:levels=1
both parts make one building with building=yes on the outline

but inside a buidling, room nearly never affect the building "external look"
so it should not be any building:part tag on a room,
except if a building:part is made by only one room of course.

for room=restaurant on amenety=restaurant, I've been talking with 
PanierAvide who add this to the wiki. he agree that this is not good.
we are working on on howto make it better.

Le 18. 04. 18 à 18:43, Pieter Vander Vennet a écrit :
> I have some experience with indoor mapping.
> 
> I would invite you guys to have a look at my work of the Blekerij in 
> Gent 
> <https://openlevelup.net/old/?lat=51.060092&lon=3.732321&z=19&t=0&lvl=0&tcd=1&urd=0&bdg=0&pic=0&nte=0&ilv=0>,
>  
> as example. Toilets can be mapped as either a point or area with 
> 'amenity=toilets, indoor=yes; level=0' (or perhaps 'level=0-2', e.g. for 
> a building with toilets on the same location on floors 0 till 2.). Note 
> that 'level=0' is the ground floor (gelijkvloers).
> 
> I have no experience with the building:part=yes. I assume that 
> indoor=yes implies 'building:part=yes' and that 'building:part' is 
> rather used for roofs etc...
> 
> 
> 
> 
> Met vriendelijke groeten,
> Pieter Vander Vennet
> 
> 2018-04-18 18:13 GMT+02:00 joost schouppe <joost.schou...@gmail.com 
> <mailto:joost.schou...@gmail.com>>:
> 
>     How does this relate to the building:part=yes strategy that
>     L'imaginaire has been playing with, e.g.
>     https://www.openstreetmap.org/way/283645760
>     <https://www.openstreetmap.org/way/283645760>
> 
>     2018-04-18 15:56 GMT+02:00 Ubipo . <ubipo.ski...@gmail.com
>     <mailto:ubipo.ski...@gmail.com>>:
> 
>         After furter consideration I think indoor=level combined with
>         amenity=restaurant should solve most problems.
>         Improving the map would then be as simple as not editing the
>         general indoor=level and just drawing new ways for individual
>         rooms (not tagged amenity=restaurant).
> 
>         A restaurant on multiple floors would indeed be tricky as
>         indoor=level implies a single level, although I think just
>         adding level=0;1 shouldn't be that bad, right?
> 
>         On 18 April 2018 at 13:58, Marc Gemis <marc.ge...@gmail.com
>         <mailto:marc.ge...@gmail.com>> wrote:
> 
>             how does someone "improve" your mapping to add a separate
>             area for
>             room=toilets ? nested room areas ? split it off ?
> 
>             m.
> 
>             On Wed, Apr 18, 2018 at 12:43 PM, Ubipo .
>             <ubipo.ski...@gmail.com <mailto:ubipo.ski...@gmail.com>> wrote:
>              > Regarding the housenumbers: street and number is as said
>             probably not needed
>              > and better reserved for the actual building, although a
>             specialised
>              > addr:addition=a could be useful for the rooms.
>              > Regarding room=restaurant, I think that tag is perfectly
>             fine. It just
>              > indicates the restaurant in it's entirety, with dining
>             room, kitchen etc.
>              >
>              > On Wed, Apr 18, 2018, 12:10 marc marc
>             <marc_marc_...@hotmail.com
>             <mailto:marc_marc_...@hotmail.com>> wrote:
>              >>
>              >> for the addr : it look like strange that the room is in
>             a building that
>              >> doesn't have the same addr:housenumber as the building.
>              >>
>              >> for multiple floors poi, you can draw all room with
>             level=* tag
>              >> or as a first step only use indoor=yes for the whole area
>              >>
>              >> room=restaurant look like also strange for me.
>              >> a restaurant is several room=* item : kitchen, dining
>             room, toilets,
>              >> cloakroom
>              >> so what's a room=restaurant ? it can not be the same as
>             the area used
>              >> for amenity=restaurant. maybe it should be the area for
>             the dining room.
>              >> the wiki advice to put both tag to the same polygon look
>             like wrong.
>              >>
>              >>
>              >> Le 18. 04. 18 à 11:56, Marc Gemis a écrit :
>              >> > o, I forgot, what about a restaurant that occupies
>             multiple floors ?
>              >> >
>              >> >
>              >> >
>              >> > On Wed, Apr 18, 2018 at 11:55 AM, Marc Gemis
>             <marc.ge...@gmail.com <mailto:marc.ge...@gmail.com>>
>              >> > wrote:
>              >> >> The idea of using indoor mapping is good, and it's
>             probably the future
>              >> >> to solve all the problems you mention. (we had a
>             similar discussion
>              >> >> last Friday on the Riot channel)
>              >> >>
>              >> >> Some remarks:
>              >> >>
>              >> >> - does it make sense for a "room" to have an house
>             number and a street
>              >> >> ? I would expect those on the building, and floor or
>             level or so on
>              >> >> the room.
>              >> >> - I'm not familiar enough with the simple  indoor
>             tagging, but I would
>              >> >> expect that a restaurant exists of multiple rooms
>             (dining, toilets,
>              >> >> kitchen) not just one.
>              >> >> - On the Riot channel the entrance to the restaurant
>             was also seen as
>              >> >> important.
>              >> >>
>              >> >> m
>              >> >>
>              >> >> On Wed, Apr 18, 2018 at 10:06 AM, Ubipo .
>             <ubipo.ski...@gmail.com <mailto:ubipo.ski...@gmail.com>>
>              >> >> wrote:
>              >> >>> Everyone,
>              >> >>>
>              >> >>> A long standing question for osm mapping in cities
>             is wether to tag
>              >> >>> amenities in multi-purpose buildings as:
>              >> >>> - a separate node inside the building's way
>              >> >>> - the building itself, using both building=house and
>             amenity=* (only
>              >> >>> valid
>              >> >>> with single-amenity buildings)
>              >> >>> The node approach has consistency issues like these
>             buildings:
>              >> >>> https://www.openstreetmap.org/node/656793551
>             <https://www.openstreetmap.org/node/656793551> .
>              >> >>>
>              >> >>> The area approach is more consistent but doesn't
>             really allow
>              >> >>> multi-purpose
>              >> >>> buildings.
>              >> >>> A third, lesser used method is to use part of the
>             simple indoor
>              >> >>> tagging
>              >> >>> schema. I've used a simplified version of this for
>             this restaurant:
>              >> >>> https://www.openstreetmap.org/way/580985564
>             <https://www.openstreetmap.org/way/580985564> .
>              >> >>> This approach uses two overlapping ways, one for the
>             general building
>              >> >>> (tagged building=house) and one for the restaurant
>             on the ground floor
>              >> >>> (tagged room=restaurant and of course
>             amenity=restaurant).
>              >> >>>
>              >> >>> Drawbacks of this are for one that the two ways
>             fully overlap. This
>              >> >>> triggers
>              >> >>> the JOSM validator and probably some QC tools.
>             Secondly renderers
>              >> >>> might have
>              >> >>> trouble placing the icons and house numbers of
>             multiple areas like
>              >> >>> this.
>              >> >>> Luckily both these problems could be fixed. The
>             positives are of
>              >> >>> course:
>              >> >>> consistency and the possibility for multiple
>             amenities (using the
>              >> >>> level=*
>              >> >>> key).
>              >> >>>
>              >> >>> What do you all think of this approach?
>              >> >>>
>              >> >>> Kind regards,
>              >> >>> Pieter (Ubipo)
>              >> >>>
>              >> >>> _______________________________________________
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>              >> >>>
>              >> >
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> 
>     -- 
>     Joost Schouppe
>     OpenStreetMap
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