メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.3125000 34.2166667, 135.3187500 34.2166667, 135.3187500 34.2208334, 135.3125000 34.2208334, 135.3125000 34.2166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral