メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.904994690503 43.4813895966435, 141.904159727459 43.4815229200427, 141.903899584152 43.4803581928379, 141.903892457255 43.4803339796607, 141.904684210645 43.4802344951073, 141.904994690503 43.4813895966435)) ^^http://www.opengis.net/ont/geosparql#wktLiteral