 Being a tool of computer-assisted legal research, the LTD provides access to all relevant case law, legislation (statutes and treaties), preparatory works as well as academic writings.All resources are stored under persistent URLs (so-called PURLs).As a consequence, courts, publishers (for example, the Torkel Opsahl Academic EPublisher) and other online services (such as Lexsitus and the CMN Knowledge Hub) hyperlink to the LTD-PURLs.