メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4562500 39.4833333, 140.4625000 39.4833333, 140.4625000 39.4875000, 140.4562500 39.4875000, 140.4562500 39.4833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral