メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.308302797012 34.8498077887704, 138.308353314338 34.8507968678179, 138.30800741175 34.8508113453176, 138.307956946944 34.8498102223812, 138.307941143174 34.8491153688407, 138.308272376544 34.8490968546779, 138.308302797012 34.8498077887704)) ^^http://www.opengis.net/ont/geosparql#wktLiteral