メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.5937500 34.8666667, 135.6000000 34.8666667, 135.6000000 34.8708334, 135.5937500 34.8708334, 135.5937500 34.8666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral