メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0500000 40.2166667, 140.0562500 40.2166667, 140.0562500 40.2208334, 140.0500000 40.2208334, 140.0500000 40.2166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral