メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.3125000 26.7875000, 128.3187500 26.7875000, 128.3187500 26.7916667, 128.3125000 26.7916667, 128.3125000 26.7875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral