メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.548187885875 43.2396668401039, 143.547479211756 43.2396983883338, 143.547476937886 43.2396729543579, 143.547377816319 43.2385658350783, 143.548096602746 43.2385352975376, 143.548183713122 43.2396153359568, 143.548187885875 43.2396668401039)) ^^http://www.opengis.net/ont/geosparql#wktLiteral