The Semantic Web encourages institutions, including libraries, to collect, link and share their data across the Web in order to ease its processing by machines to get better queries and results. Linked Data technologies enable to connect related data on the Web using the principles outlined by Tim Berners-Lee in 2006. Digital libraries have great potential to exchange and disseminate data linked to external resources using Linked Data. In this paper, a study about the current uses of Linked Data in digital libraries including the most important implementations in the world is presented. The study focuses on selected vocabularies and ontologies, benefits and problems encountered in implementing Linked Data on digital libraries. Besides, it also identifies and discusses specific challenges that digital libraries presents offering suggestions for ways in which libraries can contribute to the Semantic Web. The study uses an adapted methodology for literature review, to find data available to answer research questions. It is based on the information found in the library websites recommended by W3C Library Incubator Group in 2011, and scientific publications from Google Scholar, Scopus, ACM, and Springer from the last 5 years. The selected libraries for the study are National Library of France, Europeana Library, Library of Congress, British Library, and National Library of Spain. In this paper, we outline the best practices found in each experience and identify gaps and future trends.
Abstract-Open access journals collect, preserve and publish scientific information in digital form, but it is still difficult not only for users but also for digital libraries to evaluate the usage and impact of this kind of publications. This problem can be tackled by introducing Key Performance Indicators (KPIs), allowing us to objectively measure the performance of the journals related to the objectives pursued. In addition, Linked Data technologies constitute an opportunity to enrich the information provided by KPIs, connecting them to relevant datasets across the web. This paper describes a process to develop and publish a scorecard on the semantic web based on the ISO 2789:2013 standard using Linked Data technologies in such a way that it can be linked to related datasets. Furthermore, methodological guidelines are presented with activities. The proposed process was applied to the open journal system of a university, including the definition of the KPIs linked to the institutional strategies, the extraction, cleaning and loading of data from the data sources into a data mart, the transforming of data into RDF (Resource Description Framework), and the publication of data by means of a SPARQL endpoint using the OpenLink Virtuoso application. Additionally, the RDF data cube vocabulary has been used to publish the multidimensional data on the web. The visualization was made using CubeViz a faceted browser to present the KPIs in interactive charts.
This paper describes a process to develop and publish a scorecard from an OAJ (Open Access Journal) on the semantic web using Linked Data technologies in such a way that it can be linked to related datasets. Furthermore, methodological guidelines are presented with activities related to each step of the process. The proposed process was applied to a university OAJ from a university, including the definition of the KPIs (Key Performance Indicators) linked to the institutional strategies, the extraction, cleaning and loading of data from the data sources into a data mart, the transformation of data into RDF (Resource Description Framework), and the publication of data by means of a SPARQL endpoint using the Virtuoso software. Additionally, the RDF data cube vocabulary has been used to publish the multi-dimensional data on the Web. The visualization was made using CubeViz, a faceted browser to present the KPIs in interactive charts.
This paper surveys the main data models used in projects including the management of changes in digital normative legislation. Models have been classified based on a set of criteria, which are also proposed in the paper. Some projects have been chosen as representative for each kind of model. The advantages and problems of each type are analysed, and future trends are identified.
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