メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.986318912932 43.5561319284729, 144.986901967393 43.5556286133931, 144.987708353134 43.5560806692889, 144.9874070468 43.5563490539525, 144.987023365309 43.5563530438566, 144.986959602503 43.5564139560249, 144.986846117496 43.5563549002004, 144.98605072857 43.5563631961124, 144.986318912932 43.5561319284729)) ^^http://www.opengis.net/ont/geosparql#wktLiteral