メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.9250000 27.7291667, 128.9312500 27.7291667, 128.9312500 27.7333333, 128.9250000 27.7333333, 128.9250000 27.7291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral