メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.398233061112 44.1800959946919, 142.397015799855 44.1798984980412, 142.397196210986 44.1792501613088, 142.39845682294 44.1794507646158, 142.398233061112 44.1800959946919)) ^^http://www.opengis.net/ont/geosparql#wktLiteral