メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.102759431408 43.8270491610134, 144.100761468275 43.8277096636911, 144.100191401442 43.8267449444898, 144.100180337584 43.8267264010216, 144.102254465832 43.8260923589956, 144.102222031119 43.8261678817571, 144.102759431408 43.8270491610134)) ^^http://www.opengis.net/ont/geosparql#wktLiteral