メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.2375000 26.8083333, 128.2437500 26.8083333, 128.2437500 26.8125000, 128.2375000 26.8125000, 128.2375000 26.8083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral