メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.274238418843 44.0209413433093, 144.272686897407 44.0207925206434, 144.272656393789 44.0207895961985, 144.27278286403 44.020210722432, 144.274345132216 44.0203550780139, 144.274238418843 44.0209413433093)) ^^http://www.opengis.net/ont/geosparql#wktLiteral