メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.64686543706 32.4668033611855, 131.645736766233 32.4672307805733, 131.645574098307 32.4669766381994, 131.645122009721 32.466261969681, 131.644992692855 32.4658475118315, 131.64567307942 32.4657821357724, 131.646202997869 32.4657631826051, 131.646878732561 32.465814461631, 131.64686543706 32.4668033611855)) ^^http://www.opengis.net/ont/geosparql#wktLiteral