メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2812500 35.4500000, 140.2875000 35.4500000, 140.2875000 35.4541667, 140.2812500 35.4541667, 140.2812500 35.4500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral