メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.419012209088 43.7369556264429, 142.419055662949 43.7373965973667, 142.418381224672 43.7374363426142, 142.416652462762 43.7375381854521, 142.416600270549 43.7370779237363, 142.416544013136 43.7365818030409, 142.418959887064 43.7364245183522, 142.419012209088 43.7369556264429)) ^^http://www.opengis.net/ont/geosparql#wktLiteral