A simple search in the Amazon bookstore (Amazon.com) returns more than 300 books with the term digital library/libraries in their title. 'Digital libraries' is a topic that has been attracting a great deal of attention from researchers in a variety of academic disciplines – especially the library and information science (LIS), and computer science communities. However, there is no consensus on the formal definition of digital libraries. This is partly due to the fact that researchers in different fields look at digital libraries from different perspectives.