This paper discusses some of the methodological issues one encounters when creating and using ontologies in the rapidly expanding Linked Open Data (LOD) landscape. Over the years the notion of applied ontologies has transitioned from that of a logically formalized knowledge system with varying degrees of inferencing power to that of a lightweight knowledge representation tool. This shift is ref...

syntax to make statements about resources, and thanks to LOD principles, construct links to available external datasets in a simple manner, making them accessible and queryable through the Internet and promoting data reusability. As the amount of information at hand is greater every day, the need to handle it efficiently becomes a key requirement for anybody interested in working with it. This ...

We build on our earlier finding that more than 95% of the triples in actual RDF triple graphs have a remarkably tabular structure, whose schema does not necessarily follow from explicit metadata such as ontologies, but for which an RDF store can automatically derive by looking at the data using so-called “emergent schema” detection techniques. In this paper we investigate how computers and in p...

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Big Data researchers are dealing with the Variety of data that includes various formats such as structured, numeric, unstructured text data, email, video, and audio. The proposed Semantic Extract-Transform-Load (ETL) framework that uses semantic technologies to integrate and publish data from multiple sources as open linked data provides an extensible solution for effective data integration, fa...