メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.9937500 44.0583333, 145.0000000 44.0583333, 145.0000000 44.0625000, 144.9937500 44.0625000, 144.9937500 44.0583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral