メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395955368107 44.1695998121962, 142.394401523864 44.1693583556873, 142.394648531328 44.1685892692285, 142.396205596881 44.1688622935659, 142.395955368107 44.1695998121962)) ^^http://www.opengis.net/ont/geosparql#wktLiteral