メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5437500 36.1125000, 140.5500000 36.1125000, 140.5500000 36.1166667, 140.5437500 36.1166667, 140.5437500 36.1125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral