メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3750000 36.2291667, 140.3812500 36.2291667, 140.3812500 36.2333333, 140.3750000 36.2333333, 140.3750000 36.2291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral