メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.763689102376 43.1877462187496, 141.762797708471 43.1887037354099, 141.762774352076 43.1886918208258, 141.762340769568 43.1884699872102, 141.761872815638 43.1882442072352, 141.762370439242 43.1877296316505, 141.762793572937 43.1872873150509, 141.762961514122 43.1873675709582, 141.763465238571 43.1876273965735, 141.763689102376 43.1877462187496)) ^^http://www.opengis.net/ont/geosparql#wktLiteral