メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.549734504724 43.2407240792191, 143.548278322396 43.2407898823502, 143.548265132802 43.2406265167784, 143.548187885875 43.2396668401039, 143.549636662284 43.2396022473169, 143.549724010182 43.2405699669687, 143.549734504724 43.2407240792191)) ^^http://www.opengis.net/ont/geosparql#wktLiteral