メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4875000 37.8375000, 140.4937500 37.8375000, 140.4937500 37.8416667, 140.4875000 37.8416667, 140.4875000 37.8375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral