メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9937500 28.3166667, 130.0000000 28.3166667, 130.0000000 28.3208334, 129.9937500 28.3208334, 129.9937500 28.3166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral