メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.6312500 34.4583333, 136.6375000 34.4583333, 136.6375000 34.4625000, 136.6312500 34.4625000, 136.6312500 34.4583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral