メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.1812500 26.7041667, 128.1875000 26.7041667, 128.1875000 26.7083333, 128.1812500 26.7083333, 128.1812500 26.7041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral