メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.400993988138 43.7937763869571, 142.399026033154 43.7954191254794, 142.395944271445 43.7935050619225, 142.396866505721 43.792697453087, 142.397433956038 43.792217517662, 142.398151453801 43.7915978684437, 142.398615476045 43.791940109711, 142.400993988138 43.7937763869571)) ^^http://www.opengis.net/ont/geosparql#wktLiteral