メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.392653551148 44.164302401615, 142.391238877418 44.1640725412765, 142.391203526253 44.1640666785077, 142.391590211786 44.1629285248556, 142.393041505162 44.1631546250838, 142.392653551148 44.164302401615)) ^^http://www.opengis.net/ont/geosparql#wktLiteral