メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.902844915033 43.4645143680784, 141.90250316155 43.4645588005682, 141.902180709787 43.4646007231952, 141.901947293711 43.4646310648761, 141.901467008327 43.4646935351349, 141.900955961332 43.4629870115044, 141.901699893338 43.462872493572, 141.901974305145 43.4628302504709, 141.902336726984 43.462774454638, 141.902570921479 43.4635763304553, 141.902806661241 43.4643834501171, 141.902844915033 43.4645143680784)) ^^http://www.opengis.net/ont/geosparql#wktLiteral