Abstract Information systems have to deal with an increasing amount of data that is
heterogeneous, unstructured, or incomplete. In order to align and complete data, systems …

As the (in) famous definition states:'An ontology is an explicit specification of a
conceptualization'. However, an ontology is also a philosophical theory of existence, a …

Thoroughly covering basic introductions and intuitions, technical details, and formal
foundations, this text focuses on the established foundations in this area that have become …

In this paper, we introduce a family of expressive extensions of Datalog, called Datalog+/-,
as a new paradigm for query answering over ontologies. The Datalog+/-family admits …

Originating from Facebook, LinkedIn, Twitter, Instagram, YouTube, and many other
networking sites, the social media shared by users and the associated metadata are …

This paper provides a survey to and a comparison of state-of-the-art Semantic Web
reasoners that succeed in classifying large ontologies expressed in the tractable OWL 2 EL …

Abstract With Linked Data, a very pragmatic approach towards achieving the vision of the
Semantic Web has gained some traction in the last years. The term Linked Data refers to a …

This chapter accompanies the foundational lecture on Description Logics (DLs) at the 7th
Reasoning Web Summer School in Galway, Ireland, 2011. It introduces basic notions and …

With the advent of the Semantic Web, description logics have become one of the most
prominent paradigms for knowledge representation and reasoning. Progress in research …

Knowledge representation and reasoning has a long history of examining how knowledge
can be formalized, interpreted, and semantically analyzed by machines. In the area of …