メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.752671909794 43.1907854976002, 141.753115795295 43.1903147490118, 141.753489079674 43.1905146929787, 141.753992422814 43.1907842614492, 141.752632711994 43.192187600089, 141.751760702269 43.1917517841589, 141.7523260839 43.191152233133, 141.752671909794 43.1907854976002)) ^^http://www.opengis.net/ont/geosparql#wktLiteral