メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.77160551833 43.1955016558891, 141.770922443458 43.1962003253992, 141.770005116756 43.1957332992193, 141.770649446457 43.1950245622019, 141.771127712519 43.1952642037684, 141.771586656122 43.1954920828716, 141.77160551833 43.1955016558891)) ^^http://www.opengis.net/ont/geosparql#wktLiteral