メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.1375000 33.8875000, 135.1437500 33.8875000, 135.1437500 33.8916667, 135.1375000 33.8916667, 135.1375000 33.8875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral