メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.276176085844 44.0193708371689, 144.274594307383 44.0191966106422, 144.274675713183 44.0186456870742, 144.276203123896 44.0187918594361, 144.276288583949 44.0188005862321, 144.276176085844 44.0193708371689)) ^^http://www.opengis.net/ont/geosparql#wktLiteral