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What is the use of adding tag place=island/islet to a small coastline polygon? |
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Not everything in OSM is logical or consistent. Some of it is just so for historical reasons or for making certain uses slightly simpler. The orientation requirement for the coastline, for instance, allows drawing the water (or land) when you only look at part of the data (like a single tile). Without it you don't know which side is which without looking at the larger picture. |
