メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.6187500 27.3833333, 128.6250000 27.3833333, 128.6250000 27.3875000, 128.6187500 27.3875000, 128.6187500 27.3833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral