メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.431181530944 31.9078712126023, 131.43085055054 31.9072236764382, 131.430498312438 31.9065336516679, 131.430186109783 31.9059522789592, 131.430708353535 31.9058382306672, 131.430731032515 31.9058301222204, 131.43097035105 31.906990130097, 131.431181530944 31.9078712126023)) ^^http://www.opengis.net/ont/geosparql#wktLiteral