メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.914763685026 43.4988933824045, 141.914639476642 43.4989103884106, 141.914159277549 43.4973234304402, 141.915944260712 43.4970535142585, 141.91615197812 43.497755839151, 141.916209597329 43.497952816676, 141.916413699277 43.4986505603121, 141.914763685026 43.4988933824045)) ^^http://www.opengis.net/ont/geosparql#wktLiteral