/// return all bibkeys from buffer and its childs
void fillWithBibKeys(std::vector<std::pair<std::string, std::string> > & keys) const;
/// Update the cache with all bibfiles in use (including bibfiles
/// return all bibkeys from buffer and its childs
void fillWithBibKeys(std::vector<std::pair<std::string, std::string> > & keys) const;
/// Update the cache with all bibfiles in use (including bibfiles