On Wed, Sep 26, 2012 at 12:04:59PM +0100, Roger Calvert wrote:
If a relation has the same name as one of its components (or perhaps any name), the name of the component is lost.
I identified this on way 4798060, a small lake called 'High Dam'. Because there are islands in the lake, it is the outer component of relation 1369084, which also had the name 'High Dam'. Following mkgmap processing, the lake came out with its default name 'Reservoir'. However, when I removed the name from the relation, it came out with its correct name. (It appears correctly on OSM renderings such as mapnik).
I believe that the correct fix would have been to remove the name from the role=outer ways and keep the name in the relation. Similarly, remove any natural=water from the outer way(s) and add them to the relation. This would make the multipolygon unambiguous. Marko