メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.2437500 35.9583333, 136.2500000 35.9583333, 136.2500000 35.9625000, 136.2437500 35.9625000, 136.2437500 35.9583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral