メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4625000 32.1750000, 130.4687500 32.1750000, 130.4687500 32.1791667, 130.4625000 32.1791667, 130.4625000 32.1750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral