メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907648627832 43.4688111569721, 141.905736023426 43.4691012307253, 141.904284611728 43.4693400232149, 141.903814729172 43.4678356059174, 141.904587061165 43.4677150725089, 141.907198746877 43.4673073419112, 141.907648627832 43.4688111569721)) ^^http://www.opengis.net/ont/geosparql#wktLiteral