メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9437500 30.3958334, 130.9500000 30.3958334, 130.9500000 30.4000000, 130.9437500 30.4000000, 130.9437500 30.3958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral