メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.356723145864 43.7675760520206, 142.357028898871 43.7681202385573, 142.355552575999 43.7685430101711, 142.35524403342 43.7680131500704, 142.354946817608 43.7674725896912, 142.354962772183 43.7674679860909, 142.356438665826 43.7670421281782, 142.356723145864 43.7675760520206)) ^^http://www.opengis.net/ont/geosparql#wktLiteral