メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.1062500 34.7958334, 136.1125000 34.7958334, 136.1125000 34.8000000, 136.1062500 34.8000000, 136.1062500 34.7958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral