メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.8625000 35.3375000, 134.8687500 35.3375000, 134.8687500 35.3416667, 134.8625000 35.3416667, 134.8625000 35.3375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral