メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.0125000 26.6250000, 128.0187500 26.6250000, 128.0187500 26.6291667, 128.0125000 26.6291667, 128.0125000 26.6250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral