メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.416185302054 43.8249455023415, 142.417038825446 43.8255607650938, 142.414512067084 43.8273716226488, 142.413657444565 43.8267990796714, 142.412874372415 43.8261808939612, 142.413720774427 43.825581809979, 142.414711202951 43.8248511184251, 142.415376445334 43.8243729399506, 142.416185302054 43.8249455023415)) ^^http://www.opengis.net/ont/geosparql#wktLiteral