メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6187500 34.8958334, 135.6250000 34.8958334, 135.6250000 34.9000000, 135.6187500 34.9000000, 135.6187500 34.8958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral