メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.3875000 36.0125000, 137.3937500 36.0125000, 137.3937500 36.0166667, 137.3875000 36.0166667, 137.3875000 36.0125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral