メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.396520856709 44.1774188825272, 142.396478967494 44.1775622058548, 142.396459760319 44.1775591900401, 142.395000188346 44.1773295418768, 142.395297211681 44.1763296690691, 142.396771659298 44.1765782801288, 142.396501025106 44.1774151996809, 142.396520856709 44.1774188825272)) ^^http://www.opengis.net/ont/geosparql#wktLiteral