メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.044971084522 42.9127799506101, 143.04571295745 42.9128420442563, 143.045514892804 42.9141585581035, 143.044786873577 42.914103470257, 143.04405776056 42.9140489480009, 143.044114489486 42.913641894965, 143.044171042035 42.9132360386301, 143.044241212638 42.9127321163591, 143.044971084522 42.9127799506101)) ^^http://www.opengis.net/ont/geosparql#wktLiteral