メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.780732420347 43.2106240719312, 141.781590987595 43.2110456192508, 141.780935637378 43.2117908855405, 141.780046885108 43.2113496592095, 141.779360331203 43.2110107391794, 141.779307311261 43.2109597424136, 141.779296850388 43.210932342102, 141.779340067763 43.2108699983644, 141.779963780481 43.2102368574912, 141.780732420347 43.2106240719312)) ^^http://www.opengis.net/ont/geosparql#wktLiteral