メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.2625000 35.9666667, 137.2687500 35.9666667, 137.2687500 35.9708334, 137.2625000 35.9708334, 137.2625000 35.9666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral