メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6875000 35.0916667, 135.6937500 35.0916667, 135.6937500 35.0958334, 135.6875000 35.0958334, 135.6875000 35.0916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral