メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.1750000 33.9416667, 136.1812500 33.9416667, 136.1812500 33.9458334, 136.1750000 33.9458334, 136.1750000 33.9416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral