メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.1625000 35.1583333, 135.1687500 35.1583333, 135.1687500 35.1625000, 135.1625000 35.1625000, 135.1625000 35.1583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral