メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0500000 39.7958334, 140.0562500 39.7958334, 140.0562500 39.8000000, 140.0500000 39.8000000, 140.0500000 39.7958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral