メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.0875000 35.0000000, 136.0937500 35.0000000, 136.0937500 35.0041667, 136.0875000 35.0041667, 136.0875000 35.0000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral