メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.6750000 27.4291667, 128.6812500 27.4291667, 128.6812500 27.4333333, 128.6750000 27.4333333, 128.6750000 27.4291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral