メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.2125000 33.9416667, 136.2187500 33.9416667, 136.2187500 33.9458334, 136.2125000 33.9458334, 136.2125000 33.9416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral