メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.7812500 43.4000000, 144.7875000 43.4000000, 144.7875000 43.4041667, 144.7812500 43.4041667, 144.7812500 43.4000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral