メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.7000000 35.2500000, 139.7062500 35.2500000, 139.7062500 35.2541667, 139.7000000 35.2541667, 139.7000000 35.2500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral