メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4562500 43.4958334, 144.4625000 43.4958334, 144.4625000 43.5000000, 144.4562500 43.5000000, 144.4562500 43.4958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral