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1. Introduction
The results represented in this paper were obtained within the development of the BISIS library software system, especially of its part related to the library circulation system. The BISIS system has been developing since 1993 at the University of Novi Sad and a review of the system development is given in the paper ([13] Konjovic and Surla, 2004). The actual version of the system is 3.1. After the introduction of this version into city and special libraries some shortcomings were noticed in the existing implementation of the application for the library circulation system relating to the requirements that these libraries have in their library work. Based on the analysis of the requirements and needs of the libraries using the BISIS system, a library circulation system able to satisfy the needs of electronic management with the users of the city and special libraries was developed and is described in this paper.
The development of the fourth version of the BISIS system based on XML technology is underway. Within the version, an XML editor for cataloguing in the UNIMARC and MARC21 formats ([9] Dimic and Surla, 2009), as well as a web oriented editor for processing bibliographic material in the UNIMARC format ([3] Belic and Surla, 2008) are developed. Also, an XML editor for searching and downloading bibliographic records in accordance with Z39.50 standard ([5] Boberic and Surla, 2009) is developed. Modelling and implementation of library circulation system is presented in this paper as a component part of the research.
There are many library information systems that have also the library circulation system as a component. Within the Library of Congress site for the MARC standards[1] there is a special section containing a list of library software packages[2] . Some packages support also circulation control in addition to other functions of the library information systems. The majority of the software products are commercial and it not publicly accessible for downloading. What is possible is to download the accessible instructions for the users and, based on their contents, to analyse the software functionalities. Some of these software are ALEPH 500[3] , Voyager[4] , Atriuum[5] , Concourse[6] , CyberTools for Libraries[7] , EOS.Web[8] , etc. There are also free software products such as the Evergreen Integrated Library...