メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.382632967778 42.9873336240975, 144.380252351742 42.9869125213028, 144.380444114967 42.9863247303927, 144.382823022735 42.9867468467081, 144.382632967778 42.9873336240975)) ^^http://www.opengis.net/ont/geosparql#wktLiteral