メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.270755382641 44.0223702485828, 144.269214288109 44.0222192858154, 144.269339846774 44.0216125292386, 144.270876324089 44.0217542765807, 144.270755382641 44.0223702485828)) ^^http://www.opengis.net/ont/geosparql#wktLiteral