Martin,

I have now added a type=building relation to group the Pantheon's Simple 3D features in a logical way. It is this relation: http://www.openstreetmap.org/relation/6325840.

I added the "outline" role to the multipolygon representing the building's footprint, and added the "part" role to all building:part features in the relation. This is how a properly formed Simple 3D building should be tagged.

As you can see now on the OpenStreetMap website, whatever part you click, you can now navigate "upwards" to the parent type=building relation, to see which features are all parts of the building, and then move "downwards" to the feature with the "outline" role to get to the actual building tags. I hope you agree that navigating the buildings individual parts, and finding the actual feature that carries the buildings tags (which should always be the closed way or multipolygon with the outline role), is now fare easier.

I still wish though that the main OpenStreetMap website's interface would stop showing the senseless individual nodes or ways links first when you select a feature, and put relation links on top instead. This would make it even more obvious that there is a parent building relation present. Now, you sometimes need to scroll down considerably, to get to the relation links. In my opinion, the hierarchy of nodes/ways/relations should be reversed in the display on the website. I have never understood the choice for the current display / order, it is just not logical for navigation.

Marco

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