メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.9375000 32.8208334, 128.9437500 32.8208334, 128.9437500 32.8250000, 128.9375000 32.8250000, 128.9375000 32.8208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral