メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.45127566851 42.881099599537, 142.449156404364 42.8831298027465, 142.445125656786 42.8808448898666, 142.443808026455 42.8801152058639, 142.444346323951 42.8796076830707, 142.445995538428 42.8780527558703, 142.448251832253 42.8793653193342, 142.45127566851 42.881099599537)) ^^http://www.opengis.net/ont/geosparql#wktLiteral