メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.577714453922 43.3306189969836, 145.576641882265 43.3314182451124, 145.575584747215 43.3306320449548, 145.57662323917 43.32985074542, 145.577714453922 43.3306189969836)) ^^http://www.opengis.net/ont/geosparql#wktLiteral