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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://suomenkartta.fi/journal/article.php?3c7683=%E5%B9%B3%E6%89%8B-%E5%8F%8B-%E6%A2%A8%E5%A5%88-%E7%B4%85%E7%99%BD-youtube%096>