メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0937500 41.8000000, 140.1000000 41.8000000, 140.1000000 41.8041667, 140.0937500 41.8041667, 140.0937500 41.8000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral