メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.0625000 43.8166667, 144.0687500 43.8166667, 144.0687500 43.8208334, 144.0625000 43.8208334, 144.0625000 43.8166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral