The unique case-mapping rules for the Turkish alphabet illustrate how uppercase and lowercase mappings differ from language to language even when they use most of the same letters.

土耳其字母表的独特大小写映射规则说明了大小写映射在不同语言之间存在着差别，甚至是在它们使用的字母大多数都相同时也如此。

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Such is the case with the collaborative mapping project OpenStreetMap (OSM).

FORBES: Why OpenStreetMap Dropped the Creative Commons License