メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.123217951725 42.9705970386541, 144.122992283967 42.9704633805734, 144.121552259299 42.9696030493399, 144.12046899701 42.9689478542707, 144.121953200065 42.967407085047, 144.122083952349 42.967474501435, 144.123075732391 42.9679934025282, 144.124280897649 42.9685628124119, 144.124502076878 42.9686686915294, 144.123766024935 42.9695838389659, 144.123961116047 42.96975140308, 144.123217951725 42.9705970386541)) ^^http://www.opengis.net/ont/geosparql#wktLiteral