メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.9500000 35.4458334, 139.9562500 35.4458334, 139.9562500 35.4500000, 139.9500000 35.4500000, 139.9500000 35.4458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral