メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.751804779153 43.1885688526662, 141.751085688099 43.189303323957, 141.751018009821 43.1892696216654, 141.750560779487 43.1890529867868, 141.750144062677 43.1888248512288, 141.7506835279 43.1883199279574, 141.751804779153 43.1885688526662)) ^^http://www.opengis.net/ont/geosparql#wktLiteral