メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.418304589837 43.7428619403511, 142.418347138656 43.74335280521, 142.416238265911 43.7434719712867, 142.414342588369 43.7435783485976, 142.414291161364 43.7430836971678, 142.414220968838 43.7425890902666, 142.416146588488 43.7424753416281, 142.416148652124 43.7424935513987, 142.418252880991 43.7423644621588, 142.418304589837 43.7428619403511)) ^^http://www.opengis.net/ont/geosparql#wktLiteral