メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.2375000 44.1041667, 142.2437500 44.1041667, 142.2437500 44.1083333, 142.2375000 44.1083333, 142.2375000 44.1041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral