メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.362497117388 43.7652827397661, 142.360969139679 43.7657125345886, 142.360338953086 43.7645864437279, 142.361852515359 43.7641397752961, 142.362497117388 43.7652827397661)) ^^http://www.opengis.net/ont/geosparql#wktLiteral