メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.39443051772 44.1646060268496, 142.392653551148 44.164302401615, 142.393041505162 44.1631546250838, 142.393450643589 44.1632197044064, 142.394758644149 44.1634277318242, 142.39443051772 44.1646060268496)) ^^http://www.opengis.net/ont/geosparql#wktLiteral