Comparison of digital libraries systems

In the last decades digital libraries play an important role in knowledge sharing. There are many digital library systems for building of digital collections and repositories. Comparison of digital libraries systems was widely discussed in many scientific papers. Nevertheless, these papers are usually aimed to description and comparison of features and capabilities of digital libraries. In this paper we will compare several systems for building of digital libraries from perspective of architecture of information systems. We will focus on comparison of these systems and theirs flexibility instead of comparing theirs features and functionalities. Suitable architecture of any information system (not only a digital library) is important aspect for all institutions and can reduce cost of system implementation, modification, integration and maintenance.