DELOS, Network of Excellence on Digital Libraries, ISDL 2001, International Summer School on Digital Library, metadata, electronic resources, Open Archive Initiative, OAI, URN, Uniform Resource Names, PURL, Persistent Uniform Resouce Locator, Internet, archiving digital documents, cataloguing web sites, Multilingual Information Access, MLIA, Cross Language Information Retrieval, CLIR, information retrieval, automated indexing, Joint Information Systems Committee, JISC, video documents, dissemination and use of technical-scientific information Biblioteche digitali, metadati, risorse elettroniche, disseminazione e uso dell'informazione tecnico-scientifica, archiviazione di documenti digitali, catalogazione di siti web, recupero delle informazioni, indicizzazione automatica, documenti video