メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908432568431 43.4860431959902, 141.907508530114 43.4861889772975, 141.907506572582 43.4861892883302, 141.907161751709 43.4849749022957, 141.908078227808 43.484827417188, 141.908432568431 43.4860431959902)) ^^http://www.opengis.net/ont/geosparql#wktLiteral