メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.2187500 35.3833333, 134.2250000 35.3833333, 134.2250000 35.3875000, 134.2187500 35.3875000, 134.2187500 35.3833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral