メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.7312500 31.8833333, 130.7375000 31.8833333, 130.7375000 31.8875000, 130.7312500 31.8875000, 130.7312500 31.8833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral