メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.0187500 26.5958334, 128.0250000 26.5958334, 128.0250000 26.6000000, 128.0187500 26.6000000, 128.0187500 26.5958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral