メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9000000 32.7750000, 129.9062500 32.7750000, 129.9062500 32.7791667, 129.9000000 32.7791667, 129.9000000 32.7750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral