メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.9625000 27.7250000, 128.9687500 27.7250000, 128.9687500 27.7291667, 128.9625000 27.7291667, 128.9625000 27.7250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral