メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6562500 32.5666667, 131.6625000 32.5666667, 131.6625000 32.5708334, 131.6562500 32.5708334, 131.6562500 32.5666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral