Hi, While working on some multipolygon processing code, I noticed some cases where multipolygons contained members which were themselves multipolygons (with an inner role): http://www.openstreetmap.org/browse/relation/1450360
Since the Wiki docs don't mention such cases at all, I'm wondering about what should be the appropriate interpretation of such cases. I can see that OSM Mapnik rendering treats these as "top-level" multipolygons ( http://www.openstreetmap.org/browse/relation/1452648), probably ignoring the multipolygon -> submultipolygon relationship (I assume). Some questions: 1. What is the purpose of the "inner" role in this case? 2. Does the inner multipolygon represent a hole of the main polygon (as is the case with member ways)? 3. Are there any "outer" submultipolygons out there? If not, does the inner role even make sense? Thanks.
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