メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.402732386029 44.1729478937326, 142.402276151295 44.1728728922305, 142.401385773854 44.1727264763338, 142.400541241814 44.1725876040901, 142.400701876431 44.1720752963251, 142.402217573476 44.1723219875657, 142.402884267927 44.1724304791477, 142.402732386029 44.1729478937326)) ^^http://www.opengis.net/ont/geosparql#wktLiteral