メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4562500 37.4041667, 139.4625000 37.4041667, 139.4625000 37.4083333, 139.4562500 37.4083333, 139.4562500 37.4041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral