メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.1750000 36.1250000, 136.1812500 36.1250000, 136.1812500 36.1291667, 136.1750000 36.1291667, 136.1750000 36.1250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral