メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.4187500 39.0166667, 141.4250000 39.0166667, 141.4250000 39.0208334, 141.4187500 39.0208334, 141.4187500 39.0166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral