メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.4375000 34.9708334, 134.4437500 34.9708334, 134.4437500 34.9750000, 134.4375000 34.9750000, 134.4375000 34.9708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral