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LiU Semantic Web group at ESWC2017

Postad i kategorin: Conferences, Ontology Design Patterns den 2 June, 2017

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This week a couple of us have been at ESWC2017 in Portoroz, Slovenia. Eva Blomqvist was the general chair of the conference this year, hence, this was the culmination of a whole year of hard work for her. Olaf Hartig is the proceedings chair (proceedings part 1 and 2). He could not attend the conference this year, but has done great job with the Springer proceedings, and the upcoming post-proceedings volume with poster and demo papers among other things. In addition to this, Karl Hammar, was one of the organisers of the Modular Ontology Modeling with Ontology Design Patterns tutorial, together with Pascal Hitzler, Adila A. Krisnadhi, Agnieszka Lawrynowicz and Monika Solanki. In particular, Karl ran the hands-on session with his tool for ODP-based modelling in WebProtégé (called XDP). Finally, Henrik Eriksson, presented our EU-funded project VALCRI in the project networking session, and in the poster session.

The overall conference was interesting as always, and included a lot of networking opportunities, as well as interesting work to take a closer look at. A quick summary of some of the major events:

Crosbie

Kevin Crosbie, from Ravenpack, the first keynote speaker talking about how to model events in order to use them for predicting financial markets. Very interesting talk, describing how Ravenpack work with their data products and apply technologies very similar to Semantic Web, although technically not using the W3C standards, such as RDF.

Panel

At the end of the first day, Aldo Gangemi chaired a panel about the future of academic publishing, discussing the challenges and opportunities that lie ahead. It is clear that something needs to be done about both the reviewing situation in our field, the open access issue, and we want more focus on “eating our own dog food”. The discussions were also related to the paper that later won the best student paper award, on Linked Data Notifications.

Sheridan

Second keynote speaker, John Sheridan, from the National Archives in the UK, described how the National Archives heavily rely on Semantic Web technologies and standards to solve their archiving tasks. However there are also challenges of course, which can hopefully be solved by working together: academia and society at large. Particularly interesting for us at LiU to hear that the National Archives is in great need of a better solution for modelling trust and uncertainty in their data, which could be a potential use case for the recent research results on RDF* and SPARQL* by Olaf Hartig.

Dinner

Nice conference dinner at the beach, and a chance for the general chair to thank all the people in the organising committee.

Poster

Poster session with lots of interesting interactions and discussion, here with Diego Reforgirato, who later won both the best poster and best demo awards.

Unfortunately, we did not take any picture of the last keynote, Lora Aroyo, who gave a very interesting keynote on the last day. She started with an overview of the evolution of the field, pointing out that studying and using people to acquire knowledge has always been a central part of our research. However, by over simplifying, and trying to fit every answer into yes/no categories, we can introduce wrong conclusions. She means that we need to be aware of ambiguity and diversity in opinions, that there is usually not one true answer, and instead turn that to our advantage. Lora showed a vector-based model to represent diversity in opinions.

Finally, Aldo Gangemi will be the next general chair of ESWC in 2018, and he made a series of interesting promises for the next year, among others: double-open review process, improvements in the online pre-prints of the proceedings and the dataset, a resources track and an industry session á la ISWC, and better music in the social events. We all wish him the best of luck with the next conference, and we are excited to see all the innovations next year!


 

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Even more LiU Research at ISWC 2016 – Ontology Design Patterns

Postad i kategorin: Conferences, Ontology Design Patterns den 31 October, 2016

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In addition to the work mentioned in a previous post about ISWC, the LiU Semantic Web research team has also been very active in the Ontology Design Patterns (ODPs) sub-community at ISWC.

On Monday (October 17), Karl Hammar co-arranged the tutorial session Ontology Design Patterns for Linked Data Publishing. The tutorial was very well-received, with over 30 participants learning about ODP theory and practice, and evaluating Karl’s XD for WebProtégé ODP tooling.

On Tuesday (October 18), Karl also co-arranged the 7th Workshop on Ontology and Semantic Web Patterns, at which he also presented two papers: Template-Based Content ODP Instantiation and How to Document Ontology Design Patterns. In total there were twelve presentations given at the workshop, two keynote talks, and a town hall meeting discussing future directions of research and other issues of weight to the ODP community. Approximately 25 people attended the workshop, and the quality of the work presented and of the subsequent discussions was excellent.

WOP2

 

WOP1 WOP3 WOP4


 

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LiU Semantic Web research at ODBASE 2016

Postad i kategorin: Conferences den 24 October, 2016

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ODBASE_smallWe have two research papers in the 15th Int. Conference on Ontologies, Databases, and Applications of Semantics (ODBASE 2016) to take place this week in Rhodes, Greece. These papers are:

  • Bindings-Restricted Triple Pattern Fragments” by our Olaf Hartig and Carlos Buil-Aranda from the Universidad Tecnica Federico Santa Maria, Chile–read an extended preprint of this paper and check out the Web page for the paper.
  • Scheduling Refresh Queries for Keeping Results from a SPARQL Endpoint Up-to-Date” by Magnus Knuth (Hasso Plattner Institute, Potsdam, Germany), Olaf Hartig, and Harald Sack (Hasso Plattner Institute)–check out the preprint of this paper or the extended version which provides more details about the characteristics of the experimental data, and there is also a Web page with the experimental data.

Olaf Hartig will attend the conference and present the first of these papers. He will be happy to talk to you if you also happen to be in the conference.


 

Best Poster Award at ISWC 2016

Postad i kategorin: Conferences den 24 October, 2016

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ISWC2016BestPosterWe are very happy to announce that Olaf Hartig has won the Peoples’ Choice Best Poster Award at the 15th International Semantic Web Conference (ISWC 2016), which is the main conference in our field. The research presented on the poster is joint work with Carlos Buil-Aranda from the Universidad Tecnica Federico Santa Maria, Chile.

The poster is titled “Reducing the Network Load of Triple Pattern Fragments by Supporting Bind Joins.” You may want to read the poster paper, and there is also a Web page for this work. Additionally, a full research paper about this work (title: “Bindings-Restricted Triple Pattern Fragments“) will be published in the proceedings of the ODBASE 2016 conference; an extended pre-print of this paper is already available.


 

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LiU Semantic Web research at ISWC 2016

Postad i kategorin: Conferences den 9 October, 2016

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ISWC2016 LogoNext week a couple of use will travel to Kobe, Japan, to present our work in the 15th edition of the annual International Semantic Web Conference (ISWC 2016). In particular, we will present the following two research papers:

  • User Validation in Ontology Alignment” by Zlatan Dragisic, Valentina Ivanova, Patrick Lambrix, Daniel Faria, Ernesto Jimenez-Ruiz, and Catia Pesquita (download a pre-print of the paper), and
  • Walking without a Map: Ranking-Based Traversal for Querying Linked Data” by Olaf Hartig and M. Tamer Özsu (pre-print, and extended version).

Furthermore, Valentina Ivanova will present her PhD project in the doctoral consortium of the conference (title of Valentina’s DC paper: “Applications of Large Displays: Advancing User Support in Large Scale Ontology Alignment“), and we have two posters in the poster session, namely “Representing RDF Stream Processing Queries in RSP-SPIN” by Robin Keskisärkkä (poster paper) and “Reducing the Network Load of Triple Pattern Fragments by Supporting Bind Joins” by Olaf Hartig and Carlos Aranda-Buil (poster paper).

In addition to these contributions to the main conference, some of us are co-organizers of research workshops and challenges co-located with the conference, that is:

  • The 7th Int. Workshop on Consuming Linked Data (COLD 2016) is co-organized by Olaf Hartig,
  • The 2nd Int. Workshop on Visualization and Interaction for Ontologies and Linked Data (VOILA 2016) is co-organized by Valentina Ivanova and Patrick Lambrix, and
  • The 7th Workshop on Ontology and Semantic Web Patterns (WOP 2016) is co-organized by Karl Hammar.
  • Zlatan Dragisic, Valentina Ivanova, Huanyu Li and Patrick Lambrix organized the Anatomy track and co-organized the Interactive track of the Ontology Alignment Evaluation Initiative (OAEI 2016). The results are reported at the Ontology Matching Workshop (OM 2016).

Moreover, in the VOILA workshop, our Patrick Lambrix, Zlatan Dragisic, and Valentina Ivanova, together with Craig Anslow, have a paper titled “Visualization for Ontology Evolution” (read the paper); Karl Hammar is co-author of two papers in the WOP workshop, titled “Template-Based Content ODP Instantiation” (paper) and “How to Document Ontology Design Patterns” (paper). Last but not least, Robin Keskisärkkä has a paper about “Query Templates for RDF Stream Processing” in the Stream Reasoning Workshop (SR 2016).

We are looking forward to having a good time at ISWC in Kobe. If you happen to be there as well and want to talk to any of us, don’t be shy, just approach us.


 

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Semantic Web research at LiU

The Semantic Web is an extension of the traditional Web towards having machine processable content and interlinked data on the Web, with well-described semantics.

Ideally we would be able to view the whole Web as a large set of interconnected databases, which can be queried and browsed by software systems as well as human users. Semantic Web research at LiU includes areas such as ontologies and ontology engineering (ontology design patterns, ontology alignment and completion, ontology and alignment visualisation), graph databases and triple stores, querying the Web of data, RDF stream processing and complex event processing, as well as applications of these technologies in a number of fields, including open data, security, decision support systems, e-health and e-science, etc.

The aim of this blog is to report on the activities of our research group, and make results accessible to a wider audience.

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