メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.405854562304 44.1784844436214, 142.405816627806 44.1786091139189, 142.404739734902 44.1784411991961, 142.40492039215 44.1778653298877, 142.405969228345 44.1780314343545, 142.405991331436 44.1780349378447, 142.405854562304 44.1784844436214)) ^^http://www.opengis.net/ont/geosparql#wktLiteral