メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1750000 41.7291667, 140.1812500 41.7291667, 140.1812500 41.7333333, 140.1750000 41.7333333, 140.1750000 41.7291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral