メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.8250000 34.7333333, 137.8312500 34.7333333, 137.8312500 34.7375000, 137.8250000 34.7375000, 137.8250000 34.7333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral