10.2 Major Digital Library Architectures

In this section, we will state two of the major architectures of different digital libraries.

Architecture of Alexandria Digital Library (ADL)
The name Alexandria comes from the library of Alexandria, Egypt, which was considered the center of all knowledge/learning. The project began in 1995 with the development of the ADL, a working digital library with collections of geographically referenced materials and services for accessing those collections. The ADL project is headquartered on the campus of the University of California at Santa Barbara. ADL follows three tiered structures: client, middle ware, and server (Pandey 2003).

Architecture of California Digital Library (CDL)
The CDL was founded in 1997 by University of California President Richard Atkinson, who called it "a library without walls." Major components of CDL are as follows (Pandey 2003):

	Client Desktop
	Server Tools
	Object Metadata
	Digital Objects
	Storage
	Integrating Components

10.2 Major Digital Library Architectures

	Protocols
	Persistent identifier

Some of the major efforts / architectures / implementations, which have made a major contribution towards the digital library technology, include the following (Banerjee 2004):

	The ACM Digital Library Architecture -- developed by the ACM (USA).
	The SunSITE Architecture -- developed by the Sun Microsystems (USA) and employed at over 56 sites all over
	the world.
	The Berkeley Digital Library Architecture -- being developed at the University of California, Berkeley (USA), and
	initially received boost from the SunSITE architecture.
	The BITS DigiLib Architecture - a Digital Library being developed at the BITS, Pilani (India).
	The CMU Digital Library Architecture - being developed at the Carnegie-Mellon University, Pittsburgh (USA).
	The German MeDoc Architecture - being developed at the FRG as the national initiative.
	The IBM DB2 Digital Library Architecture - developed by the IBM Corporation (USA).
	The Stanford Digital Library Architecture - developed at the Stanford University, Stanford (USA).

10.2 Major Digital Library Architectures

	The UCSB Digital Library Architecture - being developed at the University of California, Santa Barbara (USA).
	The UIUC Digital Library Architecture - being developed at the University of Illinois, Urbana Champaign (USA).
	The University of Chicago Digital Library Architecture - being developed at the University of Chicago, Chicago
	(USA).
	The US Library of Congress Digital Library Architecture - employed at the Library of Congress, Washington
	(USA).