メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9812500 42.3583333, 140.9875000 42.3583333, 140.9875000 42.3625000, 140.9812500 42.3625000, 140.9812500 42.3583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral