Abstract
A number of accessible RDF stores are populating the linked open data world. The navigation on data reticular relationships is becoming every day more relevant. Several knowledge base present relevant links to common vocabularies while many others are going to be discovered increasing the reasoning capabilities of our knowledge base applications. In this paper, the Linked Open Graph, LOG, is presented. It is a web tool for collaborative browsing and navigation on multiple SPARQL entry points. The paper presented an overview of major problems to be addressed, a comparison with the state of the arts tools, and some details about the LOG graph computation to cope with high complexity of large Linked Open Dada graphs. The LOG.disit.org tool is also presented by means of a set of examples involving multiple RDF stores and putting in evidence the new provided features and advantages using dbPedia, Getty, Europeana, Geonames, etc. The LOG tool is free to be used, and it has been adopted, developed and/or improved in multiple projects: such as ECLAP for social media cultural heritage, Sii-Mobility for smart city, and ICARO for cloud ontology analysis, OSIM for competence/knowledge mining and analysis.
Highlights
The large publication of OD has opened the path for the information sharing
None of the above mentioned LOD browsing data tools allows to fully exploit the nature of LD/LOD by expanding their rendering and navigation on multiple SPARQL entry points, and only LodLive is accessible via web, and present relevant limitations
As described in the previous sections, the visual browsing of SPARQL entry points can be very useful for analyzing the RDF store reticular structure, that is at the basis of the ontology and the related instances of predicates contained, the knowledge base
Summary
The large publication of OD (open data) has opened the path for the information sharing. Other tools allow federating queries among multiple SPARQL entry points (RDF stores) have been proposed such as via Semantic Web Client Library [6]. This approach is typically applied for searching complementary aspects and composing the results in a unique semantic model. LodLive service is a web based RDF browser based on data graph representation (http://lodlive.it) [13] It allows to access at LD and to single SPARQL endpoints. None of the above mentioned LOD browsing data tools allows to fully exploit the nature of LD/LOD by expanding their rendering and navigation on multiple SPARQL entry points, and only LodLive is accessible via web, and present relevant limitations.
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