メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.380699415291 43.7631805560271, 142.38101332398 43.7637160693308, 142.380272989445 43.7639378757025, 142.379492783607 43.764171607015, 142.379208281393 43.7636056599824, 142.378882599046 43.7630132822754, 142.380359944445 43.7625934193612, 142.380699415291 43.7631805560271)) ^^http://www.opengis.net/ont/geosparql#wktLiteral