メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8937500 33.5375000, 129.9000000 33.5375000, 129.9000000 33.5416667, 129.8937500 33.5416667, 129.8937500 33.5375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral