メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.6625000 27.4083333, 128.6687500 27.4083333, 128.6687500 27.4125000, 128.6625000 27.4125000, 128.6625000 27.4083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral