メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.422915245376 43.8036206321504, 142.421773546072 43.8046115207193, 142.420130182861 43.8036168741277, 142.421340253279 43.8026261072175, 142.422412299976 43.8033132254666, 142.42272771773 43.8035099835412, 142.422915245376 43.8036206321504)) ^^http://www.opengis.net/ont/geosparql#wktLiteral