メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.6875000 35.1333333, 136.6937500 35.1333333, 136.6937500 35.1375000, 136.6875000 35.1375000, 136.6875000 35.1333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral