メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.354323684445 43.7695265379841, 142.354619104407 43.7700586811262, 142.35307784996 43.7705162926877, 142.352774191817 43.7699751162757, 142.352476225341 43.7694466268533, 142.352498847729 43.7694402946963, 142.354012453849 43.7689876044916, 142.354315460767 43.7695117253268, 142.354323684445 43.7695265379841)) ^^http://www.opengis.net/ont/geosparql#wktLiteral