メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3687500 32.1166667, 131.3750000 32.1166667, 131.3750000 32.1208334, 131.3687500 32.1208334, 131.3687500 32.1166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral