メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.0437500 44.0916667, 144.0500000 44.0916667, 144.0500000 44.0958334, 144.0437500 44.0958334, 144.0437500 44.0916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral