メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.2625000 36.0500000, 137.2687500 36.0500000, 137.2687500 36.0541667, 137.2625000 36.0541667, 137.2625000 36.0500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral