メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907140681418 43.4881145470709, 141.906178120331 43.4882511621148, 141.905681560755 43.4864905662431, 141.905703527957 43.4864873265778, 141.906474456418 43.486351583086, 141.906515117256 43.4863474485194, 141.906852792794 43.4875173192061, 141.906891351538 43.4876113544871, 141.907140681418 43.4881145470709)) ^^http://www.opengis.net/ont/geosparql#wktLiteral