メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.7062500 31.8291667, 130.7125000 31.8291667, 130.7125000 31.8333333, 130.7062500 31.8333333, 130.7062500 31.8291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral