メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.123332478898 42.9795952203341, 144.122639968937 42.9804349620931, 144.122221805355 42.9805371004054, 144.120906099042 42.9799873381597, 144.122590030283 42.9779243995234, 144.124119955553 42.9786471600482, 144.123332478898 42.9795952203341)) ^^http://www.opengis.net/ont/geosparql#wktLiteral