メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3562500 42.4875000, 140.3625000 42.4875000, 140.3625000 42.4916667, 140.3562500 42.4916667, 140.3562500 42.4875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral