1Association of Research Libraries.Definition and Purpose of a Digital library .http://sunsite.berkeley.edu/ARL/definition.html.
2http://www.diglib.org/dlfhomepage.htm.
3National Digital Library Federation.America's Heritage:Mission and Goals for a National Digital Library Federation.http://www.ifla.org/documents/libraries/net/digfes2.htm.
4National Digital Library Federation.NDLF Planning Task Force Final Report - June 1996.http://www.ifla.org/documents/libraries/net/plntfrep.htm.
5Natinal Digital Library Federation .Digital Preservation Consortium,Mission and Goals.http://www.ifla.org/documents/libraries/net/dpc1.txt.
