メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3187500 38.6875000, 140.3250000 38.6875000, 140.3250000 38.6916667, 140.3187500 38.6916667, 140.3187500 38.6875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral