メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.771790890675 43.2117709444252, 141.769995315683 43.2138194876853, 141.769959544925 43.2137768587654, 141.769749012759 43.2135256059211, 141.76946279752 43.213184156674, 141.7694239114 43.213146366628, 141.769121315586 43.212852459697, 141.770095738074 43.2118390336559, 141.770712265606 43.2111133626214, 141.771537861426 43.2115254260169, 141.771790890675 43.2117709444252)) ^^http://www.opengis.net/ont/geosparql#wktLiteral