メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8375000 31.7958334, 129.8437500 31.7958334, 129.8437500 31.8000000, 129.8375000 31.8000000, 129.8375000 31.7958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral