メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395492524214 44.1610065251741, 142.394160311849 44.1607874769096, 142.39416250964 44.1607679266561, 142.394528802132 44.1590193740883, 142.395693811589 44.1594478595611, 142.395538430281 44.1600820218913, 142.39572161772 44.1601194447977, 142.395492524214 44.1610065251741)) ^^http://www.opengis.net/ont/geosparql#wktLiteral