メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.856345250412 43.3451283820576, 141.852541239373 43.345714774659, 141.851933849743 43.3437056939842, 141.853761075714 43.3434318508121, 141.855779109678 43.3431196050549, 141.856345250412 43.3451283820576)) ^^http://www.opengis.net/ont/geosparql#wktLiteral