On 25/10/2010 12:04, Peter Wendorff wrote:
I'm not sure wether that's a better approach you describe here.
Of course it's a building - but also it's a museum.
So building=museum works.
There are lot's of museums without being a building.
Please see the point at the end which you +1.
Yes - you can use museum as a subtag everywhere, but to USE it you
then have to deal with a search for a value rather than to search for
a tag. IMHO that's a bad idea.
No. With tourism=yes you'd still be searching a key tag. If it isn't
relevant to tourism, you wouldn't add it. (Although see Anthony's
response to this)
Let's take the following entities:
A museum showing old buildings arranged to villages from the far past
(there are a lot of in Germany, but also in other countries). As
that's not a building (it includes buildings, but not the ensemble of
buildings form the museum, the whole area does), building:use=museum
is wrong.
area:use=museum - could be, so your idea was to use:
area:use=museum
tourism=yes
Correct.
If I want to have all tourism parts, I now could search for
tourism=yes and parse all other tags for values perhaps useful to
describe, why that entity could be relevant for tourists.
Currently it's tagged as tourism=museum, and I'm fine with that, it
allows me to fetch the kind of interest it has for tourism directly by
that tag.
Of course tourists are not the only group interested in museums.
This is the main point I've been making.
There is science as well as "normal" people living around.
But even these groups would search for museums partly as tourism POIs
often.
If there are other "indended uses", we can use additional tags, too:
Tag a museum as entity of tourism, science, recreational place,
leisure, garden, shop, artwork, historic place, ruins etc. - all of
these could be correct for some museums around the world. We have
these tags, so we can use them without using some tags as "primary".
Yes - I think. "primary" tags should describe the physicality of an
entity. All the others you describe above could be sub (secondary) tags.
What tag is a "primary" one depends heavily on the context I want to
build a map for.
Museums (& art galleries) are used by many people other than tourists.
To indicate that it might be of interest to tourists a sub key such
as tourism=yes could be used.
But what is it for tourists? A museum for tourists could be a science
institute for scientists, a playground for children and a shop for the
chinese subgroup of tourists.
We could it tag as shop, playground and museum - if we skip the hunt
for the one and only set of primary tags.
Not sure i understand you fully, but I wasn't suggesting the tourism=yes
is the only sub tag you could add.
Other sub tags can be added to give a full description of what the
entity is & what it's used for.
How should one know which tags are
considered primary when parsing the OSM database?
That's up to the parser. However putting tourism=art_gallery for
example gives no indication of what type it is:
Is it indoors or outdoors?
Is it in a building, marquee, greenhouse? etc.
+1
Cheers
Dave F.
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