メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.9312500 35.7708334, 137.9375000 35.7708334, 137.9375000 35.7750000, 137.9312500 35.7750000, 137.9312500 35.7708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral