With libferris, you can turn anything into a virtual file system. And since the file system is a tree, it turns out that the sharing of XQuery and libferris provides a universal system for querying data. How exactly, shows the article " XQuery, libferris and virtual file systems ."
This seems to be the first .ru article telling about libferris. If you like it, raise the karma to the translation author, kate_kulikova .