メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907747049973 43.4746928620531, 141.907810012483 43.4749135869904, 141.908043228398 43.4757331042562, 141.906916599924 43.4758988773332, 141.906325018418 43.4759895524224, 141.906017745613 43.4749692454541, 141.90573696487 43.4739958536586, 141.906337020035 43.4739018662828, 141.907469237767 43.4737445532441, 141.907568862166 43.4740684478968, 141.907747049973 43.4746928620531)) ^^http://www.opengis.net/ont/geosparql#wktLiteral