メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.351881558458 43.7715349107087, 142.352181025229 43.7720861140837, 142.350665129689 43.7725359212716, 142.350609969294 43.7724317550518, 142.350355762052 43.7719750360543, 142.350039975682 43.7713958533678, 142.350509694219 43.7712600132935, 142.351564956344 43.7709470844888, 142.351881558458 43.7715349107087)) ^^http://www.opengis.net/ont/geosparql#wktLiteral