メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.668712567047 32.5715643439989, 131.669138002792 32.5714860334784, 131.669148818593 32.5719130449034, 131.669157766071 32.5720427069664, 131.66880954933 32.5720656887044, 131.66848500907 32.5720945323745, 131.668375374346 32.5715923731727, 131.668158000726 32.5715982443958, 131.668162217599 32.5712288553682, 131.668148831808 32.5708078804972, 131.668539386504 32.5708793706842, 131.668712567047 32.5715643439989)) ^^http://www.opengis.net/ont/geosparql#wktLiteral