メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.342262901282 43.0234868800404, 141.341497612085 43.0232911221465, 141.342035241993 43.0225963730139, 141.342084150144 43.0226078035343, 141.342646486426 43.0227662203985, 141.342262901282 43.0234868800404)) ^^http://www.opengis.net/ont/geosparql#wktLiteral