メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.4312500 41.3708334, 141.4375000 41.3708334, 141.4375000 41.3750000, 141.4312500 41.3750000, 141.4312500 41.3708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral