AFAIK, the correct way of tagging is:
way 1 - amenity=townhall
way 2 - no tag

relation
type=multipolygon

way 1 = outer
way 2 = inner

I'll check other data to verify.

On Wed, Nov 17, 2010 at 8:34 PM, Greg Troxel <g...@ir.bbn.com> wrote:
>
> maning sambale <emmanuel.samb...@gmail.com> writes:
>
>> This way is tagged as a amenity=townhall and a multipolygon relation:
>> http://www.openstreetmap.org/browse/way/24159829
>> http://www.openstreetmap.org/browse/relation/452620
>>
>> In my style:
>> polygons:
>> building=* | man_made=* | amenity=* | tourism=* [0x13 resolution 24]
>>
>> and in the points:
>> amenity=townhall [0x3003 resolution 21]
>> building=* [0x6402 resolution 24]
>>
>> I have the add-pois-areas switch enabled
>>
>> This resulted to two POI icons (the little PH flag) in garmin
>> http://farm2.static.flickr.com/1290/5184379090_bbeeeaffc8_b.jpg
>
> So I think that the relation inherits tags from the outer way, and thus
> both the multipolygon and the way get a poi point generated.  I don't
> think this is a mkgmap bug.
>
> What if you take the amenity/buiding/name tags off the outer way and put
> them on the relation?  I am coming to the tenative conclusion that the
> map data is wrong.  Or can you point to the rules for multipolygons and
> buildings that say putting the data on an outer way is correct?
>
>
>



-- 
cheers,
maning
------------------------------------------------------
"Freedom is still the most radical idea of all" -N.Branden
wiki: http://esambale.wikispaces.com/
blog: http://epsg4253.wordpress.com/
------------------------------------------------------
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