メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.998437982204 43.5628979704812, 144.998122291793 43.5627692888654, 144.997950550127 43.5626885108998, 144.997820947967 43.5626157899566, 144.998733144056 43.5618535633497, 144.99886639678 43.5619427550389, 144.999184637706 43.5617155615207, 144.999596433395 43.5619756729839, 144.998437982204 43.5628979704812)) ^^http://www.opengis.net/ont/geosparql#wktLiteral