メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3250000 40.5083333, 141.3312500 40.5083333, 141.3312500 40.5125000, 141.3250000 40.5125000, 141.3250000 40.5083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral