メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.321816836889 43.0805304501132, 141.321960720611 43.0804437065451, 141.32259117028 43.0801577323624, 141.322709704259 43.0801039783473, 141.322841169909 43.0802615970222, 141.323266218356 43.0806491112607, 141.322411602296 43.0811346221472, 141.321215899303 43.081828694871, 141.321086445162 43.0817094908242, 141.320856890804 43.0815096499535, 141.320590794917 43.0812518423617, 141.321256840017 43.080858557369, 141.321816836889 43.0805304501132)) ^^http://www.opengis.net/ont/geosparql#wktLiteral