メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3937500 40.8791667, 140.4000000 40.8791667, 140.4000000 40.8833333, 140.3937500 40.8833333, 140.3937500 40.8791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral