メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.378858076945 43.7662373476684, 142.378874037587 43.766265300107, 142.379159802886 43.7667656712108, 142.37761016123 43.7672274370624, 142.377602782792 43.7672143125079, 142.377634360911 43.7672054348974, 142.377346222446 43.7666614990804, 142.377063480853 43.7661275767881, 142.37855320966 43.7656782789178, 142.378858076945 43.7662373476684)) ^^http://www.opengis.net/ont/geosparql#wktLiteral