メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.9562500 27.6708334, 128.9625000 27.6708334, 128.9625000 27.6750000, 128.9562500 27.6750000, 128.9562500 27.6708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral