メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.0062500 26.6291667, 128.0125000 26.6291667, 128.0125000 26.6333333, 128.0062500 26.6333333, 128.0062500 26.6291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral