メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3875000 35.9166667, 140.3937500 35.9166667, 140.3937500 35.9208334, 140.3875000 35.9208334, 140.3875000 35.9166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral