メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4062500 43.3750000, 144.4125000 43.3750000, 144.4125000 43.3791667, 144.4062500 43.3791667, 144.4062500 43.3750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral