メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.357325588981 43.0801023942138, 141.35719527121 43.0806784935453, 141.355644109079 43.0804753567314, 141.355795335465 43.0799270622309, 141.355935818499 43.0793322661573, 141.357488108025 43.0795285860196, 141.357381009224 43.0799199725026, 141.357325588981 43.0801023942138)) ^^http://www.opengis.net/ont/geosparql#wktLiteral