メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.3875000 35.4458334, 138.3937500 35.4458334, 138.3937500 35.4500000, 138.3875000 35.4500000, 138.3875000 35.4458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral