メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.409652200876 43.8274107274481, 142.410468382024 43.8279565051201, 142.409470511226 43.8287086372783, 142.407995627109 43.8297482774089, 142.40716058369 43.8291776404291, 142.406333440064 43.8285708785724, 142.408839573967 43.8268032604404, 142.409652200876 43.8274107274481)) ^^http://www.opengis.net/ont/geosparql#wktLiteral