メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5437500 37.3958334, 139.5500000 37.3958334, 139.5500000 37.4000000, 139.5437500 37.4000000, 139.5437500 37.3958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral