メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.5812500 27.3916667, 128.5875000 27.3916667, 128.5875000 27.3958334, 128.5812500 27.3958334, 128.5812500 27.3916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral