メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.6187500 36.2250000, 139.6250000 36.2250000, 139.6250000 36.2291667, 139.6187500 36.2291667, 139.6187500 36.2250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral