メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.4937500 35.0833333, 136.5000000 35.0833333, 136.5000000 35.0875000, 136.4937500 35.0875000, 136.4937500 35.0833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral