メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908327958656 43.4890984001043, 141.907441251789 43.4892270587812, 141.907140681418 43.4881145470709, 141.908004179197 43.4879750947594, 141.908149348556 43.4884787499571, 141.908327958656 43.4890984001043)) ^^http://www.opengis.net/ont/geosparql#wktLiteral