Given the primary mission of libraries, archives, and documentation centers in meeting the need of users for information, a number of novel models are currently considered for designing such centers, particularly web-based digital libraries.

These libraries are distinguished from other models based on their numerous capabilities in managing digital information. Libraries and documentation centers have always been places for keeping, using, and disseminating human information, and increasing amount of data, expansion of the world wide web, and advent of different vehicles for information on one hand and increasing researchers’ interest in different electronic forms of data on the other have created a particular function for libraries and especially the digital ones. Given the primary mission of libraries, archives, and documentation centers in meeting the need of users for information, Hannan Digital Library is a comprehensive model for designing digital libraries at such centers. With its developed capacities in the area of digital data management, Hannan Digital Library can not only attract many customers but also cover a wide range of needs felt by these customers. The software have been designed to help managers of information centers in storing, organizing, logically accessing any form of digital data, interpreting, distributing, and ensuring proper protection of digital works in long term and to access these resources in a fast and economical manner. Adapting knowledge to particular context of our country and effective management of knowledge have always been among major concerns of information managers.

Hannan Digital Library was designed based on advanced technologies and standards in IT using a user-oriented approach for all of its web-based components. A list of prominent features of this library is provided below:
Web-based components with no limitation for user
Supporting all browsers
Multilingual user interface
Dynamic data fields and worksheets
Dynamic formats of data representation based on DC standard
Data storage in the standard format known as Dublin Core
Simultaneous management of digital resources at several centers by defining communities, sub-communities, and collections
Managing and keeping several digital copies of records
Structural grouping in designing digital library (departments, units, centers, and collections)
Full-text searching
Integrated search function for bibliographies and contents
Management of different digital objects (text, image, video, audio)
Supporting various digital formats (text, image, video, audio)
Supporting mail server
Simultaneous management of several library units (community & sub-community), and collections in integrated comprehensive system
Centralized management of bibliographical data and digital contents
Centralized management of digital resources and common formats
Facilitated process for building digital libraries at information centers, libraries, and archives

Hannan Digital Library not only manages digital resources of an information center by creating centers for storing and controlling digital information, but also provides predesigned and dynamic libraries using variety of models:
Hannan Digitization Library
Hannan Medical Digital Library
Hannan Engineering Digital Library
Hannan Digital Library for Fundamental Science
Hannan Digital Library for Agriculture and Environment
Hannan Digital Library for Islamic Science and Humanities
Hannan Digital Library of Standards One model used by DIAKONET in offering digital libraries is Hannan Digitization Library. The model can be used to facilitate development of digital information centers for libraries, archive centers of educational organizations, academic centers and research institutes. If digital resources are available at these centers in advance, the model can be easily established and the information may be converted for application at a program center. A new gate will be established for receiving and storing new digital resources of data. Once this process is completed, an up-to-date digital library is established and can be easily controlled.