メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.4437500 33.5625000, 131.4500000 33.5625000, 131.4500000 33.5666667, 131.4437500 33.5666667, 131.4437500 33.5625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral