メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.361285973702 43.7481672423235, 142.35971431904 43.7488727359326, 142.359685946301 43.7487943543539, 142.359504433842 43.7484294914615, 142.360908945888 43.7477244441826, 142.361900300535 43.7472700776481, 142.362282051553 43.7477196890294, 142.361285973702 43.7481672423235)) ^^http://www.opengis.net/ont/geosparql#wktLiteral