メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.0437500 36.5458334, 137.0500000 36.5458334, 137.0500000 36.5500000, 137.0437500 36.5500000, 137.0437500 36.5458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral