メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.390769765459 43.6866059166742, 142.389113464163 43.6861159016391, 142.390400602596 43.6837868628217, 142.392039762712 43.6842765295107, 142.391312416519 43.6856568821059, 142.390769765459 43.6866059166742)) ^^http://www.opengis.net/ont/geosparql#wktLiteral