メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.7125000 37.1250000, 139.7187500 37.1250000, 139.7187500 37.1291667, 139.7125000 37.1291667, 139.7125000 37.1250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral