メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.2875000 35.2583333, 137.2937500 35.2583333, 137.2937500 35.2625000, 137.2875000 35.2625000, 137.2875000 35.2583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral