メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.325623279629 43.7960209024566, 142.325660790617 43.7959978654355, 142.32603803381 43.7962789861344, 142.325445081743 43.7967155630058, 142.32483266432 43.7966009032936, 142.323463454818 43.7963821450933, 142.32373613086 43.7961779857949, 142.324805137984 43.7953932994483, 142.32481529991 43.795401168745, 142.325214195855 43.7956854077488, 142.325196920366 43.7957189094693, 142.325623279629 43.7960209024566)) ^^http://www.opengis.net/ont/geosparql#wktLiteral