メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4562500 42.1583333, 140.4625000 42.1583333, 140.4625000 42.1625000, 140.4562500 42.1625000, 140.4562500 42.1583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral