メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.7625000 43.3416667, 143.7687500 43.3416667, 143.7687500 43.3458334, 143.7625000 43.3458334, 143.7625000 43.3416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral