メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6375000 30.3000000, 130.6437500 30.3000000, 130.6437500 30.3041667, 130.6375000 30.3041667, 130.6375000 30.3000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral