メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.2812500 35.0416667, 137.2875000 35.0416667, 137.2875000 35.0458334, 137.2812500 35.0458334, 137.2812500 35.0416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral