Gregory Williams invented a relation type=associatedParking to link a car park to its parent entity. He's used it 3 times in Thanet., for instance here <http://www.openstreetmap.org/browse/relation/2194736>.
I think this is very useful: particularly for clarifying what access=customers or access=employees might mean. It also helps map out an area occupied by say a suburban pub or fast food outlet without needing (and often somewhat misleading) landuse=retail, but still allows analysis of these isolated retail areas. I've been meaning to use it for a while, and have just added the 4th instance of this relation to the previously mismapped Hilton car park in Nottingham (the mis-mapping from aerial photos, had unfortunately acquired further wheelchair related tags due to an erroneous name). The only thing I'm not sure about is having the role of the owning entity blank. Any suggestions for a name for the role. Note that the relation between parking owning entity is not necessarily m:1, it could be 1:m (e.g., take-aways sharing a car park), or even m:n. Cheers, Jerry
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