メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.377664022667 43.7783946781489, 142.376929012273 43.7786104607351, 142.37612128107 43.7788483446281, 142.376096451138 43.7788556500299, 142.375611194391 43.7779851289057, 142.375310517562 43.7774565245765, 142.376164427512 43.7772125314829, 142.376906607292 43.7770038149921, 142.377664022667 43.7783946781489)) ^^http://www.opengis.net/ont/geosparql#wktLiteral