メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.40747839631 44.173173521257, 142.40677107797 44.1730558311397, 142.406629647662 44.1730322936163, 142.40742539166 44.1705097836304, 142.408219366303 44.1706526820764, 142.407603907528 44.1727465655542, 142.40747839631 44.173173521257)) ^^http://www.opengis.net/ont/geosparql#wktLiteral