メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.6062500 27.3875000, 128.6125000 27.3875000, 128.6125000 27.3916667, 128.6062500 27.3916667, 128.6062500 27.3875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral