メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.773189839014 43.1984225726918, 141.772692847178 43.1989246871633, 141.771859815058 43.1998105864015, 141.771423967078 43.1995813300263, 141.770861786152 43.1993051214521, 141.77146115392 43.198651960289, 141.772173849533 43.1978985517348, 141.773189839014 43.1984225726918)) ^^http://www.opengis.net/ont/geosparql#wktLiteral