Webs sempre accessibles: les biblioteques nacionals i els dipòsits digitals nacionals = Webs siempre accesibles: las bibliotecas nacionales y los depósitos digitales nacionales

摘要

Information and communication technologies enabled cultural and scientific patrimony -and information in general- to be presented in digital format, as well as in traditional analogical formats. The response was immediate and since the decade of the 1990s different projects have been designed to guarantee permanent access to the digital production -retrieval, storage, handling, preservation and dissemination. This article presents an international overview of existing models of national digital repositories, a name given to these projects that are normally generated by national libraries with a common objective: ensuring that web pages are always accessible.