メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.747221382054 42.9042388680346, 140.746606824621 42.9042568159896, 140.7465309463 42.9033752718634, 140.747736217947 42.9033157819425, 140.747818701723 42.904205781545, 140.747221382054 42.9042388680346)) ^^http://www.opengis.net/ont/geosparql#wktLiteral