メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.9937500 36.2541667, 138.0000000 36.2541667, 138.0000000 36.2583333, 137.9937500 36.2583333, 137.9937500 36.2541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral