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Library, historically a cornerstone of scholarly endeavor, is reinventing itself in today's network society to meet new demands. Instead of a building that holds books, library is evolving into an electronic portal to a growing global collection of digital contents. Doors to this digital library are now open 24 hours a day, seven days a week, and the library's holdings come to the user whenever needed. Today's libraries include sophisticated tools that make them easy to find the best information resources, delivering them to one's desktop or mobile computing device by just one click.
As we daily see, there are many companies that are heavily investing in information acquisition, clustering, indexing, searching and in one word information retrieval and data mining. It should be noticed that there are many features and researchers' needs that are yet to be envisioned.
Digital libraries are more heterogeneous than traditional libraries, which have ever been in their objects and collections, their formats, their user communities, and in the services they offer. Traditional libraries have specialized in some aspects of providing qualitative information which are determined both by its own activity defining the jurisdiction and by the social and cultural context within which it works.
Digital libraries expand far beyond this to encompass what has been the domain of data centers, personal or group collections into the contents of the objects heretofore treated only as packages, books and journal titles. The structural model of information sources that once could be considered as three distinct domains: original work, indexing and abstracting services and encyclopedias, are now merged in the new digital library environment. In addition, digital libraries are coming into the work environment where contribution, access, and processing occur and assembly of information into usable ideas takes place.
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