メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.1562500 34.6375000, 137.1625000 34.6375000, 137.1625000 34.6416667, 137.1562500 34.6416667, 137.1562500 34.6375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral