メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.936138047903 42.9401931570151, 142.935047562486 42.9408687399193, 142.93496452992 42.9409170613429, 142.934077257818 42.9401127087198, 142.935256880541 42.9394086802911, 142.935546611861 42.9396688603314, 142.936138047903 42.9401931570151)) ^^http://www.opengis.net/ont/geosparql#wktLiteral