メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.0750000 32.9208334, 129.0812500 32.9208334, 129.0812500 32.9250000, 129.0750000 32.9250000, 129.0750000 32.9208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral