メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.756935932388 43.1992857194123, 141.756610352312 43.1996301917658, 141.756310645551 43.1999484014672, 141.755284732348 43.1994475979892, 141.755314736835 43.1994162925672, 141.75559632019 43.1991224810121, 141.755932533313 43.1987830499286, 141.756935932388 43.1992857194123)) ^^http://www.opengis.net/ont/geosparql#wktLiteral