メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.520417994596 43.8591097449066, 141.520773709021 43.8583902660918, 141.520834712537 43.8582769035712, 141.522347140734 43.8587258536834, 141.522809376391 43.8580318784799, 141.52361931822 43.8583319043823, 141.524950270172 43.858267561058, 141.524956516585 43.8583176685716, 141.525048298818 43.8590528935804, 141.525265533209 43.8590228895715, 141.525267708402 43.8591403291251, 141.523620046827 43.8593335839421, 141.521697387929 43.8592827046474, 141.520705801523 43.8591504589898, 141.520417994596 43.8591097449066)) ^^http://www.opengis.net/ont/geosparql#wktLiteral