メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.2812500 33.8666667, 135.2875000 33.8666667, 135.2875000 33.8708334, 135.2812500 33.8708334, 135.2812500 33.8666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral