メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.4812500 32.0000000, 131.4875000 32.0000000, 131.4875000 32.0041667, 131.4812500 32.0041667, 131.4812500 32.0000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral