メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.0437500 26.5458334, 128.0500000 26.5458334, 128.0500000 26.5500000, 128.0437500 26.5500000, 128.0437500 26.5458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral