メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.041410943944 43.5756483116688, 142.041328886158 43.5755382834718, 142.040193139014 43.5741676377026, 142.040447915566 43.5739982540379, 142.041775548977 43.5755091110888, 142.041410943944 43.5756483116688)) ^^http://www.opengis.net/ont/geosparql#wktLiteral