メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907878010457 43.4969489051988, 141.907073960105 43.4970747756089, 141.906773616198 43.4959432048148, 141.907555014064 43.4958357290154, 141.907878010457 43.4969489051988)) ^^http://www.opengis.net/ont/geosparql#wktLiteral