メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4500000 35.5458334, 139.4562500 35.5458334, 139.4562500 35.5500000, 139.4500000 35.5500000, 139.4500000 35.5458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral