メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2500000 39.5958334, 140.2562500 39.5958334, 140.2562500 39.6000000, 140.2500000 39.6000000, 140.2500000 39.5958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral