メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.6437500 27.3958334, 128.6500000 27.3958334, 128.6500000 27.4000000, 128.6437500 27.4000000, 128.6437500 27.3958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral