メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.886665252976 43.3874366827801, 141.886636811574 43.3874479138444, 141.884067778978 43.387863355459, 141.883462743308 43.3860698451381, 141.886155148936 43.3856446221007, 141.886177253977 43.3857501127579, 141.886673557807 43.3872564642751, 141.886677727791 43.3873052136523, 141.886672998008 43.387350629059, 141.886654955208 43.3873927665495, 141.886665252976 43.3874366827801)) ^^http://www.opengis.net/ont/geosparql#wktLiteral