メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.1125000 33.0875000, 129.1187500 33.0875000, 129.1187500 33.0916667, 129.1125000 33.0916667, 129.1125000 33.0875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral