メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6437500 32.6458334, 130.6500000 32.6458334, 130.6500000 32.6500000, 130.6437500 32.6500000, 130.6437500 32.6458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral