メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.000944690425 43.5666759332951, 144.999443683284 43.5679858918532, 144.998897125843 43.5676131024777, 144.999655552562 43.5669514347109, 144.999273880704 43.5655740096044, 145.0001291171 43.5661380507906, 145.000889225322 43.5666387348948, 145.000944690425 43.5666759332951)) ^^http://www.opengis.net/ont/geosparql#wktLiteral