メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.754607412075 43.1892393541346, 141.753489079674 43.1905146929787, 141.753115795295 43.1903147490118, 141.752031951537 43.1897749130495, 141.752929000048 43.1888198863418, 141.753367063462 43.1889116669388, 141.753968521088 43.1890512729704, 141.75423995755 43.1891273479108, 141.754607412075 43.1892393541346)) ^^http://www.opengis.net/ont/geosparql#wktLiteral