The ELISE II Project: A Digital Image Library for Europe.

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This paper describes the progress made under the ELISE II electronic image library project from a technical standpoint. The ELISE II project is a European-wide initiative that aims to provide a comprehensive electronic image library service for Europe. It is funded under the European Commission, DG XIII-E, Telematics for Libraries Initiative. The ELISE system is composed of a JAVA client which runs on the user's Web browser and allows access to the system; a broker, based on JAVA servlet technology; and a set of distributed, non-compatible image databases located all over Europe. This paper discusses the major design emphasis in the development of the ELISE system; the overall architecture of the ELISE II system; the use of the Z39.50 protocol and Dublin Core metadata standard; HUNT and RTE databases mappings; implementation of the GUI client; and implementation of the broker. (AEF) Reproductions supplied by EDRS are the best that can be made from the original document. C31 http://www.hut.filevents/eunis99/Csession/C31.htm The ELISE II Project, A Digital Image Library for Europe Bob Strunz, Mairead Waters University of Limerick, Ireland Abstract This paper describes the progress made under the ELISE II electronic image library project from a technical standpoint. The Elise II project is a European-wide initiative which aims to provide a comprehensive electronic image library service for Europe. It is funded under the European Commission, DG XIII-E, Telematics for Libraries' initiative. Introduction The ELISE project has developed a comprehensive JAVA based demonstration system which provides controlled access to images and associated textual information. Eight of the partners are providing a variety of image data to the imagebank including still images, and streaming video. At the time of writing, there are over 30,000 images available on the set of demonstration databases.This paper describes the progress made under the ELISE II electronic image library project from a technical standpoint. The Elise II project is a European-wide initiative which aims to provide a comprehensive electronic image library service for Europe. It is funded under the European Commission, DG XIII-E, Telematics for Libraries' initiative. Introduction The ELISE project has developed a comprehensive JAVA based demonstration system which provides controlled access to images and associated textual information. Eight of the partners are providing a variety of image data to the imagebank including still images, and streaming video. At the time of writing, there are over 30,000 images available on the set of demonstration databases. The system is composed of four component parts : o A JAVA client which runs on the users web-browser and allows access to the system. o A Broker, based on JAVA servlet technology o A set of distributed, non-compatible image databases located all over Europe. The major design emphasis in the development of the ELISE system was on flexibility with the ability to easily add additional databases to the system being of paramount importance. It was decided to utilise a combination of tried and tested library technology to integrate the databases so that the design team could concentrate their efforts on designing the user interface and broker architecture which relies on less mature technology. Overall System Architecture The architecture of the ELISE II system is as shown in figure 1, the JAVA GUI client communicates with the broker via the web, the broker, which is a JAVA servlet, communicates with the image databases. Two separate protocols are used for this communication, the searching is done using the Z39.50 protocol which allows us to perform simultaneous searches on multiple databases. The images themselves are returned using the HTTPS protocol via a standard web server such as ApacheTM. This communication is at present, in clear, however experiments have been done to utilise SSL to encrypt the data. The architecture of the system is such that the component parts of it may be widely distributed, this is in fact the case, in the current version of the system, the Broker servlet runs on a machine in the UK and the Database Image Server (DBIS) is located in Tilburg in the Netherlands. With the benefit of hindsight, the development of the system in this fashion, while it made perfect sense at the time, has resulted in performance difficulties. The network links between the institutions are insufficiently fast to provide the user with the performance one usually expects from a web based system. 00 U.S. DEPARTMENT OF EDUCATION Office of Educational Research and Improvement /1. EDUCATIONAL RESOURCES INFORMATION

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