メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.994737244031 43.5557633348636, 144.994244669949 43.5554603539507, 144.994232136181 43.5554526380728, 144.9951252039 43.5547175854379, 144.995630550878 43.5550335811941, 144.994737244031 43.5557633348636)) ^^http://www.opengis.net/ont/geosparql#wktLiteral