メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.7312500 37.4125000, 139.7375000 37.4125000, 139.7375000 37.4166667, 139.7312500 37.4166667, 139.7312500 37.4125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral