メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4875000 43.1000000, 144.4937500 43.1000000, 144.4937500 43.1041667, 144.4875000 43.1041667, 144.4875000 43.1000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral