メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2875000 39.0291667, 141.2937500 39.0291667, 141.2937500 39.0333333, 141.2875000 39.0333333, 141.2875000 39.0291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral