メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.978006848641 43.5595186454457, 144.97729575427 43.5600967987417, 144.977219517323 43.5600445440971, 144.976870378171 43.5598246952808, 144.976406056123 43.5595123134971, 144.977130231004 43.5589454212233, 144.978006848641 43.5595186454457)) ^^http://www.opengis.net/ont/geosparql#wktLiteral