メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.7250000 36.7791667, 139.7312500 36.7791667, 139.7312500 36.7833333, 139.7250000 36.7833333, 139.7250000 36.7791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral