メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9562500 31.3791667, 130.9625000 31.3791667, 130.9625000 31.3833333, 130.9562500 31.3833333, 130.9562500 31.3791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral