メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.343346632249 43.7961556537473, 142.342866292891 43.7964894419278, 142.342416779387 43.7968008402697, 142.342028966904 43.7970695896461, 142.340375014038 43.7958864578744, 142.340766792493 43.7956042271692, 142.341210143419 43.7952903261634, 142.341687553076 43.7949586759906, 142.342789651852 43.795746663704, 142.343346632249 43.7961556537473)) ^^http://www.opengis.net/ont/geosparql#wktLiteral