メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.1437500 36.7250000, 137.1500000 36.7250000, 137.1500000 36.7291667, 137.1437500 36.7291667, 137.1437500 36.7250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral