メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.991703522286 43.1125729636367, 142.988572397434 43.1131682389224, 142.987895359858 43.1110952479363, 142.989401025637 43.1107255062425, 142.990457644025 43.1104968518719, 142.990555302353 43.1104757540677, 142.990919466896 43.1103977206764, 142.991703522286 43.1125729636367)) ^^http://www.opengis.net/ont/geosparql#wktLiteral