メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.761779110388 43.1904608235782, 141.762266196845 43.1907003284375, 141.760895614411 43.1921309928515, 141.760417398856 43.191893137971, 141.759947421415 43.1916594652984, 141.761334166265 43.1902344369346, 141.761779110388 43.1904608235782)) ^^http://www.opengis.net/ont/geosparql#wktLiteral