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Software Tools
In 2021, the group has made significant progress in improving the engines Ontop and RDFox, and developed a new system Ontopic Studio for designing VKGs.
Ontop (https:/ontop-vkg.org/) is the state-of-the-art open-source VKG engine. The Ontop project is hosted by the Free University of Bolzano, and is also commercially supported by the company Ontopic, which became
SIRIUS partner in 2020. SIRIUS is continuing to contribute to the development of this tool. In 2021, there were two major releases of Ontop (v4.1 and v4.2) with an extensive list of new features and optimization techniques (https:/ ontop-vkg.org/guide/releases.html). Notably, Ontop v4.1 added supports for GeoSPARQL and Dremio, features a new query logger and the specification of custom WebAPIs, and embeds new optimizations, memory consumption decreased. Ontop v4.2 introduces support for Apache Spark, Ontop views, TBox information, time functions, robust data type extraction and, as usual, novel optimizations and many bug fixes. Ontop has been widely used in industrial and academic projects. According to SourceForge, it has been downloaded for a total of 62K times since 2015 and 16K times in 2021.
Recently, the Community Leader badge (for open-source projects that have reached the milestone of 50,000 total downloads) was awarded to Ontop by SourceForge.
RDFox (https:/www.oxfordsemantic.tech/product) is
a high-performance in-memory knowledge graph and semantic reasoner, optimised for speed and efficiency, initially developed by University of Oxford, and currently
by Oxford Semantic Technologies. In 2021, along with performance enhancements, the latest version of RDFox brings a variety of new capabilities and updates. RDFox now supports SHACL, property paths and we include a release dedicated to the new Apple M1 ARM chip. These develop- ments mean RDFox now has complete support for SPARQL 1.1. Moreover, the console has new slick features and the support for OWL and Solr has been updated for increased usability.
Ontopic Studio (https:/ontopic.ai/en/ontopic-studio/) is Ontopic’s flagship product developed starting from 2019 and first released in 2021. It allows users to easily create Virtual Knowledge Graphs from a multitude of sources, such as data lakes, databases, Excel files, and to quickly adapt to changes in the data landscape. It features a carefully
Figure 2. Mapping Editing in Ontopic Studio
30 | SIRIUS ANNUAL REPORT 2021