メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.374663026601 43.7649219968543, 142.374980347991 43.7654874613246, 142.373451667246 43.7659313394657, 142.373138943103 43.7653731445511, 142.372815225935 43.7647850209467, 142.374336458771 43.7643412828033, 142.374663026601 43.7649219968543)) ^^http://www.opengis.net/ont/geosparql#wktLiteral