メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.374039046598 43.7638026404207, 142.374336458771 43.7643412828033, 142.372815225935 43.7647850209467, 142.372531625819 43.7642585442598, 142.372214612854 43.7637119550515, 142.373741635968 43.7632682170977, 142.374039046598 43.7638026404207)) ^^http://www.opengis.net/ont/geosparql#wktLiteral