メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.413796221752 43.7381843898623, 142.413828073247 43.7386697870621, 142.411938980071 43.7387818424158, 142.409802388684 43.7388971964073, 142.409766920532 43.7384257429282, 142.409722862048 43.7379419247054, 142.411844417629 43.7378024920549, 142.413726467697 43.7377005924861, 142.413796221752 43.7381843898623)) ^^http://www.opengis.net/ont/geosparql#wktLiteral