メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.5500000 43.4000000, 144.5562500 43.4000000, 144.5562500 43.4041667, 144.5500000 43.4041667, 144.5500000 43.4000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral