メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.714336334884 44.3694085262915, 141.713767588293 44.369817749094, 141.71276335748 44.3689500695892, 141.71336011283 44.368607921413, 141.714336334884 44.3694085262915)) ^^http://www.opengis.net/ont/geosparql#wktLiteral