メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.2562500 43.9916667, 144.2625000 43.9916667, 144.2625000 43.9958334, 144.2562500 43.9958334, 144.2562500 43.9916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral