メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.5000000 34.5208334, 136.5062500 34.5208334, 136.5062500 34.5250000, 136.5000000 34.5250000, 136.5000000 34.5208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral