メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.400011262299 43.7892801571068, 142.401015770735 43.7899074398603, 142.399893530378 43.7908690653897, 142.398865837903 43.7902351041367, 142.39777294757 43.7895764622179, 142.397794343352 43.7895583269958, 142.398288798132 43.7891390822223, 142.398923125627 43.7886184953779, 142.400011262299 43.7892801571068)) ^^http://www.opengis.net/ont/geosparql#wktLiteral