メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.8812500 31.3125000, 130.8875000 31.3125000, 130.8875000 31.3166667, 130.8812500 31.3166667, 130.8812500 31.3125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral