メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.243476712416 37.0391327239561, 138.242230589008 37.0397087479415, 138.241763020672 37.0399097200951, 138.241396703672 37.0393765902767, 138.240640949685 37.0382958489422, 138.240092138029 37.0374980905084, 138.241122388881 37.0370230754621, 138.242807171873 37.0362665824265, 138.243476712416 37.0391327239561)) ^^http://www.opengis.net/ont/geosparql#wktLiteral