メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.396477090947 44.1597366576465, 142.395693811589 44.1594478595611, 142.394528802132 44.1590193740883, 142.394899070527 44.1577952437352, 142.3962152082 44.1580314247678, 142.396877472186 44.1581601717831, 142.396477090947 44.1597366576465)) ^^http://www.opengis.net/ont/geosparql#wktLiteral