メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.038070442882 42.9188185900569, 143.03875879442 42.9188770881694, 143.038586191753 42.9200456437093, 143.037911566246 42.91999886608, 143.037876318591 42.9199963651118, 143.037192121539 42.9199492979014, 143.037340518165 42.9187566461065, 143.038070442882 42.9188185900569)) ^^http://www.opengis.net/ont/geosparql#wktLiteral