メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.437925222576 43.8078248010545, 142.436771512948 43.8071181146081, 142.436566514063 43.8069932095988, 142.436029355799 43.8066659383511, 142.435809076198 43.8065243736608, 142.436531214385 43.8059192551791, 142.43727999513 43.805307583195, 142.438815741052 43.8062503115136, 142.43938549797 43.8066000361797, 142.437925222576 43.8078248010545)) ^^http://www.opengis.net/ont/geosparql#wktLiteral