メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.419184800843 43.7388838138724, 142.419243460308 43.7393516250019, 142.417938728764 43.7394418983413, 142.417894376163 43.7389636764858, 142.417856726947 43.7384752484519, 142.419147933849 43.7383838884171, 142.419184800843 43.7388838138724)) ^^http://www.opengis.net/ont/geosparql#wktLiteral