メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.123793430928 42.9743540071218, 144.122790611261 42.9754885120679, 144.121619555895 42.9749615700334, 144.120021150275 42.9742063484654, 144.121208195368 42.9728862122228, 144.121570485912 42.9724718171076, 144.122655109498 42.9729926496768, 144.124311314468 42.9737840900622, 144.123793430928 42.9743540071218)) ^^http://www.opengis.net/ont/geosparql#wktLiteral