メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4375000 38.4000000, 140.4437500 38.4000000, 140.4437500 38.4041667, 140.4375000 38.4041667, 140.4375000 38.4000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral