メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6500000 34.8125000, 135.6562500 34.8125000, 135.6562500 34.8166667, 135.6500000 34.8166667, 135.6500000 34.8125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral