メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905971333253 43.4960659784454, 141.905208170179 43.4961890054004, 141.904879601767 43.4950505588332, 141.905665006699 43.4949293241575, 141.905672709481 43.4949549456297, 141.905996787256 43.4960618708713, 141.905971333253 43.4960659784454)) ^^http://www.opengis.net/ont/geosparql#wktLiteral