メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.4812500 28.3958334, 129.4875000 28.3958334, 129.4875000 28.4000000, 129.4812500 28.4000000, 129.4812500 28.3958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral