Hi, I'm trying to map Southsea Castle [1], but I'm not sure how best to do it, because it consists of an outer keep/wall with an inner courtyard. (think of a ring doughnut) How should I mark it up so that it is rendered as a building with a hollow core? Russ [1] http://www.openstreetmap.org/?lat=50.778145&lon=-1.088634&zoom=18&layers=B00FT