メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4437500 31.3416667, 130.4500000 31.3416667, 130.4500000 31.3458334, 130.4437500 31.3458334, 130.4437500 31.3416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral