メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.3500000 35.4625000, 136.3562500 35.4625000, 136.3562500 35.4666667, 136.3500000 35.4666667, 136.3500000 35.4625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral