メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.6812500 27.4208334, 128.6875000 27.4208334, 128.6875000 27.4250000, 128.6812500 27.4250000, 128.6812500 27.4208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral