September 9th, 2021 at 1pm CEST: In particular, we would like to invite you to the DBpedia Ontology session at the DBpedia Day at SEMANTiCS 2021 to discuss the future roadmap for Archivo as a Unified Semantic Ontology Space (USOS) and what the role of the DBpedia Ontology will be in the Semantic Web.

Session Topics

The session will host impulse talks with ample room for discussion. For the first time in the history of the Semantic Web, Archivo offers the possibility to create a Unified Semantic Ontology Space (USOS), a holistic view over all available ontologies. Instead of soft and fuzzy principles such as FAIR, we will discuss hard, implementable criteria to evaluate ontologies in preparation of a well-defined, measurable standard, which will ultimately yield better and reliable ontologies for industrial applications. Another topic is the central collaboration on links and mappings between ontologies to create a more dense and well-connected web of ontologies. Join the discussion and register here.

Successes and Highlights

An Exhaustive Ontology Archive

We implemented 5 discovery mechanisms that run each week. These mechanisms have proven effective to develop Archivo into one of the most exhaustive ontology archives. As of today, Archivo provides an alternative, persistent download location for 1407 ontologies. Growth has not reached a plateau, yet and it is steadily growing at a pace of 12.6 ontologies per week (6 month average). 

Community Adoption

While 1246 ontologies were automatically discovered, we also received 159 user submission (i.e. adding the Ontology URL at https://archivo.dbpedia.org/add). Archivo is also serving 90 ontology downloads on an average day (plus 640 daily downloads from major bots) and will soon provide popularity ratings. The archive can be downloaded as a whole. Note that we also keep some ontologies that are no longer available under their original URL such as: GEORSS (info, download) to allow stable operation of the Semantic Web. 

Ontology Accessibility

Archivo uses all kinds of cunning tricks to find, access and persist ontologies. Our crawlers and parsers have matured over the last year and – although we might have overlooked something – we are quite certain that the following statement holds: “If DBpedia Archivo can not process an ontology, the ontology is not retrievable or parseable, which will negatively impact all further applications”.  On the other hand, if Archivo manages to access and parse the ontology, it will be persisted for future generations (following a fair use / no abuse policy regarding size restrictions). 

Ontology Quality vs. Coverage

Besides accessibility, Archivo evaluates availability and conformity of license statements as well as consistency as a minimal baseline to assign the 4 Archivo stars. On August 16th, 2021, we can report that the web of ontology reached above 2 stars on average with 303 ★★★★, 246 ★★★☆, 18 ★★☆☆ and 836 ★☆☆☆ ontologies. Two weeks later the average fell to 1.999 stars as 4 more ontologies were discovered.  We see it as a challenge for Archivo to likewise improve the orthogonal goals of exhaustive coverage as well as high quality ontologies. We believe, however, that the system is able to accommodate both over time. 

Versioning

Ontologies are checked every 8 hours for changes. So far Archivo has archived 3713 for the 1407 ontologies. Ontology practitioners are now able to code applications to specific archived ontology versions and need not fear that major ontological changes are published under the same URL, breaking SPARQL queries and applications.  

Stay safe and check Twitter or LinkedIn. Furthermore, you can subscribe to our Newsletter for the latest news and information around DBpedia.

Sebastian Hellmann

on behalf of the DBpedia Association

The post DBpedia Archivo: 1 Year Retrospective appeared first on DBpedia Association.

First and foremost, we would like to thank the LSWT organizing team for hosting these events. Following, we will give you a brief retrospective about the presentations. For further details of the tutorial follow the link to the slides.

Talks at the LSWT 

Opening

Nathanael Arndt (AKSW / InfAI) opened the third session of the LSWT 2021 with a few welcoming words and information about the programme schedule.

Updates DBpedia: Stable Releases

Afterwards, Marvin Hofer (InfAI / DBpedia Association) spoke about the Milestones of the DBpedia Association before presenting the three major DBpedia editions – Latest core, DBpedia Global & DBpedia Live. 

Latest Core and Tiny Diamond

Marvin explained the differences between the latest core dataset and the snapshot edition – Tiny Diamond. The latest core data is online for 1 year and gets monthly updates of its contained dataset. It contains community extensions, developer debugging as well as rapid community reviewing. The DBpedia snapshot release is the same kind of data as the Latest core, contains the main content of DBpedia and is more stable and consistent. The next snapshot release will be published by end of July 2021. Check more details here. 

DBpedia Global

Furthermore, Marvin introduced DBpedia Global, a more powerful kernel for LOD Cloud Knowledge Graph that ultimately strengthens the utility of Linked Data principles by adding more decentralization i.e., broadening the scope of Linked Data associated with DBpedia. It was released in June 2021 and you can read more details on the DBpedia blog. Finally, Marvin demonstrated that DBpedia Global can be used very visually with an example of Erich Schröger. To get more information feel free to check out the presentation here.

DBpedia Archivo

Following, Dennis Streitmatter (InfAI / DBpedia Association) explained how DBpedia Archivo can be used, especially in order of ontology FAIRness which aims to improve (re)usability. Therefore, he presented ways to find an ontology, how to access ontologies via an API, how to interoperate an ontology and how to reuse it. Speaking about interoperable ontologies, he also showed the star rating system, which is testing parsing, license and consistency for the ontologies usability. To get more information about DBpedia Archivo feel free to check out the presentation here. 

DBpedia Live 2.0

As the last part of the session, Alex Winter (InfAI / DBpedia Association) and Maximilian Ressel (InfAI / DBpedia Association) presented DBpedia Live 2.0 which is a cool new API and is more flexible and usable than the recent DBpedia Live version. The goal of the project is to have an always up-to-date DBpedia Knowledge Graph. It started at the beginning of 2021 and it is only available in German and English, although they will adopt more languages. For the future they aim to find early adopters and gain first customers to further improve the service so it can be even more usable. To get more information about DBpedia Live, please go to the DBpedia website or check out the presentation here.

Outro

At the very end Nathanael closed the LSWT 2021 with some thank you words to all presentators, the audience as well as the co-organisators. The next LSWT will be part of a bigger event – the Data Week – which will also include a special DBpedia event. Stay tuned!

DBpedia Tech Tutorial @ LSWT 2021 on July 8

Opening

Jan Forberg (InfAI / DBpedia Association) opened the online tutorial with some general information about the program of the tutorial, the scope and the technical information.

DBpedia in a Nutshell and Getting Started with DBpedia sessions

After the opening, Jan continued with the first topic, the background on the DBpedia Association – how it all started and the evolution of DBpedia. The DBpedia Ontology was also addressed as well as the mappings, extractors and data groups (e.g. mappings, generic, text, wikidata). Jan concluded the first topic with information on the DBpedia Knowledge Graph Diamonds.

Getting Started with DBpedia session

In addition, Jan explained where to find data including DBpedia SPARQL endpoint, the DBpedia Databus platform as a repository for DBpedia and related datasets and the novel “collections” concept. Furthermore he demonstrated how to use the DBpedia data and the DBpedia Knowledge Graph.

DBpedia Technology Stack

Fabian Götz (InfAI / DBpedia Association) opened the session with a talk about the DBpedia Databus platform. He explicated how the Databus platform works, the Databus SPARQL endpoints and the Web API as well as the Maven Plugin. After that, he presented dockersized services including DBpedia Virtuoso and the DBpedia Plugin, DBpedia Spotlight (incl. use cases) and DBpedia Lookup.

Afterwards, Marvin Hofer (InfAI / DBpedia Association) explained the DBpedia release process on the Databus and showed his work on debugging DBpedia and the DBpedia Mods technology. He also demonstrated the quality assurance process using the concept of  minidumps. Furthermore, the topics (Pre)fusion, ID management and the novel concept of cartridges were explained by him.

Subsequently, Denis Streitmatter (InfAI / DBpedia Association) presented the DBpedia Archivo ontology manager and how to include ontologies here. He showed various use cases, e.g. how to find ontology, how to test your ontology and how to back it up. Then he shared the ontology tests 4 star schema and the SHACL based tests for ontologies with the audience. Please read the official DBpedia Archivo call here.

Contributions to DBpedia and Outro

As it got to the end of the tutorial, Denis Streitmatter (InfAI / DBpedia Association) explained how to improve mappings or introduce new mappings. He talked about improvement of the DBpedia Information Extraction Framework as well as contributing to DBpedia tests. Afterwards, Marvin Hofer presented how to contribute to DBpedia by writing SHACL tests or by editing mappings. Finally, Jan Forberg closed the meeting by taking questions from the audience. 

In case you missed the tutorial, our presentation is also available here. Further insights, feedback and photos about the event are available on Twitter (#DBpediaTutorial).

We are now looking forward to the next DBpedia tutorial, which will be held on September 1, 2021 co-located with the LDK conference in Zaragoza, Spain. Check more details here and register now! Furthermore, we will organize the DBpedia Day on September 9, 2021 at the Semantics Conference in Amsterdam. We are looking forward to meeting all Dutch DBpedians there! 

Stay safe and check Twitter or LinkedIn. Furthermore, you can subscribe to our Newsletter for the latest news and information around DBpedia.

Julia & Emma

on behalf of the DBpedia Association

The post LSWT 2021 – Wrap Up: DBpedia Talks and Tech Tutorial appeared first on DBpedia Association.

DBpedia Autumn Hackathon and the KGiA Conference

From September 21st to October 1st, 2020 we organized the first Autumn Hackathon. We invited all community members to join and contribute to this new format. You had the chance to experience the latest technology provided by the DBpedia Association members. We hosted special member tracks, a Dutch National Knowledge Graph Track and a track to improve DBpedia. Results were presented at the final hackathon event on October 5, 2020. We uploaded all contributions on our Youtube channel. Many thanks for all your contributions and invested time!

The Knowledge Graphs in Action event

The SEMANTiCS Onsite Conference 2020 had to be postponed till September 2021. To bridge the gap until 2021, we took the opportunity to organize the Knowledge Graphs in Action online track as a SEMANTiCS satellite event on October 6, 2020. This new online conference is a combination of two existing events: the DBpedia Community Meeting, which is regularly held as part of the SEMANTiCS, and the annual Spatial Linked Data conference organised by EuroSDR and the Platform Linked Data Netherlands. We glued it together and as a bonus we added a track about Geo-information Integration organized by EuroSDR. As special joint sessions we presented four keynote speakers. More than 130 knowledge graph enthusiasts joined the KGiA event and it was a great success for the organizing team. Do you miss the event? No problem! We uploaded all recorded sessions on the DBpedia youtube channel.

KnowConn Conference 2020

Our CEO, Sebastian Hellmann, gave the talk ‘DBpedia Databus – A platform to evolve knowledge and AI from versioned web files’ on December 2, 2020 at the KnowledgeConnexions Online Conference. It was a great success and we received a lot of positive and constructive feedback for the DBpedia Databus. If you missed his talk and looking for Sebastians slides, please check here: http://tinyurl.com/connexions-2020

DBpedia Archivo – Call to improve the web of ontologies

On December 7, 2020 we introduced the DBpedia Archivo – an augmented ontology archive and interface to implement FAIRer ontologies. Each ontology is rated with 4 stars measuring basic FAIR features. We would like to call on all ontology maintainers and consumers to help us increase the average star rating of the web of ontologies by fixing and improving its ontologies. You can easily check an ontology at https://archivo.dbpedia.org/info. Further infos on how to help us are available in a detailed post on our blog. 

Member features on the blog

At the beginning of November 2020 we started the member feature on the blog. We gave DBpedia members the chance to present special products, tools and applications. We published several posts in which DBpedia members, like Ontotext, GNOSS, the Semantic Web Company, TerminusDB or FinScience shared unique insights with the community. In the beginning of 2021 we will continue with interesting posts and presentations. Stay tuned!

We do hope we will meet you and some new faces during our events next year. The DBpedia Association wants to get to know you because DBpedia is a community effort and would not continue to develop, improve and grow without you. We plan to have meetings in 2021 at the Knowledge Graph Conference, the LDK conference in Zaragoza, Spain and the SEMANTiCS conference in Amsterdam, Netherlands.

Happy New Year to all of you! Stay safe and check Twitter, LinkedIn and our Website or subscribe to our Newsletter for the latest news and information.

Yours,

DBpedia Association

The post A year with DBpedia – Retrospective Part 2/2020 appeared first on DBpedia Association.

We are proud to announce DBpedia Archivo – an augmented ontology archive and interface to implement FAIRer ontologies. Each ontology is rated with 4 stars measuring basic FAIR features. We discovered 890 ontologies reaching on average 1.95 out of 4 stars. Many of them have no or unclear licenses and have issues w.r.t. retrieval and parsing. 

DBpedia Archivo: Community action on individual ontologies

We would like to call on all ontology maintainers and consumers to help us increase the average star rating of the web of ontologies by fixing and improving its ontologies. You can easily check an ontology at https://archivo.dbpedia.org/info. If you are an ontology maintainer just release a patched version – archivo will automatically pick it up 8 hours later. If you are a user of an ontology and want your consumed data to become FAIRer, please inform the ontology maintainer about the issues found with Archivo.

The star rating is very basic and only requires fixing small things. However, the impact on technical and legal usability can be immense.

Community action on all ontologies (quality, FAIRness, conformity)

Archivo is extensible and allows contributions to give consumers a central place to encode their requirements. We envision fostering adherence to standards and strengthening incentives for publishers to build a better (FAIRer) web of ontologies.

1. SHACL (https://www.w3.org/TR/shacl/, co-edited by DBpedia’s CTO D. Kontokostas) enables easy testing of ontologies. Archivo offers free SHACL continuous integration testing for ontologies. Anyone can implement their SHACL tests and add them to the SHACL library on Github. We believe that there are many synergies, i.e. SHACL tests for your ontology are helpful for others as well. 
2. We are looking for ontology experts to join DBpedia and discuss further validation (e.g. stars) to increase FAIRness and quality of ontologies. We are forming a steering committee and also a PC for the upcoming Vocarnival at SEMANTiCS 2021. Please message hellmann@informatik.uni-leipzig.de if you would like to join. We would like to extend the Archivo platform with relevant visualisations, tests, editing aides, mapping management tools and quality checks. 

How does DBpedia Archivo work?

Each week Archivo runs several discovery algorithms to scan for new ontologies. Once discovered Archivo checks them every 8 hours. When changes are detected, Archivo downloads and rates and archives the latest snapshot persistently on the DBpedia Databus.

Archivo’s mission

Archivo’s mission is to improve FAIRness (findability, accessibility, interoperability, and reusability) of all available ontologies on the Semantic Web. Archivo is not a guideline, it is fully automated, machine-readable and enforces interoperability with its star rating.

– Ontology developers can implement against Archivo until they reach more stars. The stars and tests are designed to guarantee the interoperability and fitness of the ontology.

– Ontology users can better find, access and re-use ontologies. Snapshots are persisted in case the original is not reachable anymore adding a layer of reliability to the decentral web of ontologies.

Please find the current paper about DBpedia Archivo here: https://svn.aksw.org/papers/2020/semantics_archivo/public.pdf 

Let’s all join together to make the web of ontologies more reliable and stable.

Yours,

Johannes Frey, Denis Streitmatter, Fabian Götz, Sebastian Hellmann and Natanael Arndt

The post DBpedia Archivo – Call to improve the web of ontologies appeared first on DBpedia Association.