メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.797670546201 43.2016327796685, 141.796093270493 43.2015525842425, 141.795113841097 43.2017855173027, 141.795236453979 43.2007056791858, 141.795265749111 43.2003900881379, 141.795268993138 43.2003413635199, 141.797756561472 43.2004711415695, 141.797670546201 43.2016327796685)) ^^http://www.opengis.net/ont/geosparql#wktLiteral