メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4312500 35.6458334, 139.4375000 35.6458334, 139.4375000 35.6500000, 139.4312500 35.6500000, 139.4312500 35.6458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral