メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.8125000 38.1541667, 140.8187500 38.1541667, 140.8187500 38.1583333, 140.8125000 38.1583333, 140.8125000 38.1541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral