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This paper offers a definition of the core of information science, which encompasses most research in the field. The definition provides a unique identity for information science and positions it in the disciplinary universe.

After motivating the objective, a definition of the core and an explanation of its key aspects are provided. The definition is related to other definitions of information science before controversial discourse aspects are briefly addressed: discipline vs. field, science vs. humanities, library vs. information science and application vs. theory. Interdisciplinarity as an often-assumed foundation of information science is challenged.

Information science is concerned with how information is manifested across space and time. Information is manifested to facilitate and support the representation, access, documentation and preservation of ideas, activities, or practices, and to enable different types of interactions. Research and professional practice encompass the infrastructures – institutions and technology –and phenomena and practices around manifested information across space and time as its core contribution to the scholarly landscape. Information science collaborates with other disciplines to work on complex information problems that need multi- and interdisciplinary approaches to address them.

The paper argues that new information problems may change the core of the field, but throughout its existence, the discipline has remained quite stable in its central focus, yet proved to be highly adaptive to the tremendous changes in the forms, practices, institutions and technologies around and for manifested information.

The purpose of this paper is to develop a journal recommender system, which compares the content similarities between a manuscript and the existing journal articles in two subject corpora (covering the social sciences and medicine). The study examines the appropriateness of three text similarity measures and the impact of numerous aspects of corpus documents on system performance.

Implemented three similarity measures one at a time on a journal recommender system with two separate journal corpora. Two distinct samples of test abstracts were classified and evaluated based on the normalized discounted cumulative gain.

The BM25 similarity measure outperforms both the cosine and unigram language similarity measures overall. The unigram language measure shows the lowest performance. The performance results are significantly different between each pair of similarity measures, while the BM25 and cosine similarity measures are moderately correlated. The cosine similarity achieves better performance for subjects with higher density of technical vocabulary and shorter corpus documents. Moreover, increasing the number of corpus journals in the domain of social sciences achieved better performance for cosine similarity and BM25.

This is the first work related to comparing the suitability of a number of string-based similarity measures with distinct corpora for journal recommender systems.

The general science portal “vascoda” merges structured, high‐quality information collections from more than 40 providers on the basis of search engine technology (FAST) and a concept which treats semantic heterogeneity between different controlled vocabularies. First experiences with the portal show some weaknesses of this approach which come out in most metadata‐driven Digital Libraries (DLs) or subject specific portals. The purpose of the paper is to propose models to reduce the semantic complexity in heterogeneous DLs. The aim is to introduce value‐added services (treatment of term vagueness and document re‐ranking) that gain a certain quality in DLs if they are combined with heterogeneity components established in the project “Competence Center Modeling and Treatment of Semantic Heterogeneity”.

Two methods, which are derived from scientometrics and network analysis, will be implemented with the objective to re‐rank result sets by the following structural properties: the ranking of the results by core journals (so‐called Bradfordizing) and ranking by centrality of authors in co‐authorship networks.

The methods, which will be implemented, focus on the query and on the result side of a search and are designed to positively influence each other. Conceptually, they will improve the search quality and guarantee that the most relevant documents in result sets will be ranked higher.

The central impact of the paper focuses on the integration of three structural value‐adding methods, which aim at reducing the semantic complexity represented in distributed DLs at several stages in the information retrieval process: query construction, search and ranking and re‐ranking.

The purpose of this article is to introduce the papers in the special issue which explores some of the potential, opportunities and challenges to be found in greater library and information science alignment with semantic web developments.

The article is a general review of the papers in the issue.

For many digital libraries or cultural institutions, the semantic web offers an opportunity to better expose valuable digital resources pertaining to research, culture or history, using common standards and technologies in a collaborative and “joined up” way. The papers in this issue “paint a rainbow”, exploring the issues through elements of case studies, reviews research and conceptual expositions and viewpoints.

The article emphasises how the practical implications of semantic web research or developments for digital libraries and repositories is important for LIS professionals.

The chapter “Books Open Worlds for People Behind Bars” by Gerhard Peschers gives an insight into library services in correctional facilities in Germany on different levels, ranging from local best practice examples (e.g., Berlin, Bremen, Dortmund, and Würzburg) via regional experiences – focusing on longstanding experiences in North Rhine-Westphalia, in particular the outstanding former Münster prison library which was awarded the German national Library Prize “Library of the Year 2007” – and nationwide subjects to grown internationality based on long-term integration into the library community. Fundamental issues include history and the legal basis of prison libraries as well as practical experiences on various levels of responsibility and its diverse scope of tasks, such as collection development, data processing, interior design, events, and cooperation with city libraries.

The outlook provides the state of play and the challenges regarding digitalization for the development of prison libraries.

Finally, the author’s dream of the book tree on the prison wall, which found international resonance, invites you to share the vision of dialog and tolerance across dividing walls.

The purpose of this paper is to verify the proposition by the University of Illinois, Urbana‐Champaign (UIUC), that their return on investment (ROI) formula developed for academic libraries and based on hard facts is broad enough to be used throughout the world for ROI studies in academic institutions/libraries. It further aims to verify that UIUC's methodology is adaptable enough to work in other academic environments as well.

The methodology developed by UIUC (an ROI formula developed for academic libraries based on grant proposal applications and citations) has been “copied” and thereby adapted to enable it to be used in an academic environment in Europe/Germany.

The methodology developed by UIUC was adaptable enough to be used in a German academic environment for calculating the ROI of a University library. However, the methodology was sometimes complicated and therefore simplified for this and possible further studies. Likewise, the ROI formula was very complex and this study found that it was possible to simplify it as well for further use.

There was difficulty in gathering all the information necessary for conducting such a study in Germany as grant proposals contain sensitive data that people are unwilling to display. Further, it was noticeable that German statistics on funding were unable to provide the necessary data without further enquiries, despite the German law that public institutions are obliged to disclose funding information.

Previously no one else has tried to verify the methodology for an ROI study developed by UIUC. This study gives evidence that UIUC was right in claiming that their ROI formula developed for academic institutions/libraries may be used for any academic library in the world. Further, this study shows how the formula and the methodology may be adapted to fit individual academic environments.