メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.376813569957 43.7800874260795, 142.376488187068 43.7801983103666, 142.376163748424 43.7803322233141, 142.375422051804 43.7805597464509, 142.374697372079 43.7792342307849, 142.375430715196 43.7790320895785, 142.376096451138 43.7788556500299, 142.37612128107 43.7788483446281, 142.376813569957 43.7800874260795)) ^^http://www.opengis.net/ont/geosparql#wktLiteral