メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.5000000 34.8041667, 135.5062500 34.8041667, 135.5062500 34.8083333, 135.5000000 34.8083333, 135.5000000 34.8041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral