メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347940307072 44.4864528464845, 142.347142293788 44.4862506056425, 142.347542402883 44.4854897640614, 142.347660410409 44.4852653663978, 142.348387198213 44.4854904804934, 142.348010365127 44.4862265191753, 142.347940307072 44.4864528464845)) ^^http://www.opengis.net/ont/geosparql#wktLiteral