メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.373354221875 43.0486821756441, 141.372180936896 43.0494099636547, 141.371183612421 43.0485300783871, 141.372362069313 43.0478024105726, 141.37263282389 43.0480481093394, 141.372825633687 43.0482120495701, 141.373354221875 43.0486821756441)) ^^http://www.opengis.net/ont/geosparql#wktLiteral