メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.880005084132 43.3446669983364, 141.880372942341 43.3458369791089, 141.880531630286 43.3463999811641, 141.877144289101 43.3469328641256, 141.876628267891 43.3451914075812, 141.87623309052 43.3440655745323, 141.877491861267 43.3438486466312, 141.879643949637 43.3435107545045, 141.879997701181 43.3446450319359, 141.880005084132 43.3446669983364)) ^^http://www.opengis.net/ont/geosparql#wktLiteral