メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.0312500 33.7958334, 136.0375000 33.7958334, 136.0375000 33.8000000, 136.0312500 33.8000000, 136.0312500 33.7958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral