メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7937500 37.0500000, 140.8000000 37.0500000, 140.8000000 37.0541667, 140.7937500 37.0541667, 140.7937500 37.0500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral