メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4125000 42.9916667, 144.4187500 42.9916667, 144.4187500 42.9958334, 144.4125000 42.9958334, 144.4125000 42.9916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral