メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.368257368903 43.7693015763974, 142.36674001941 43.7697403497734, 142.366442085191 43.7692088633823, 142.367594894759 43.7688802568793, 142.367956556844 43.7687636110314, 142.368257368903 43.7693015763974)) ^^http://www.opengis.net/ont/geosparql#wktLiteral