1. Multi-synchronous Collaborative Semantic Wikis Charbel Rahhal, Hala Skaf-Molli, Pascal Molli, Stéphane Weiss Inria Nancy-Grand Est Nancy University, France Pascal Molli

2. Context Wikis are emblematic of the Web 2.0 It is a collaborative tool : The web is a Read/Write space Web content is built by users : they produce, but they also communicate and coordinate through the wiki It is a social tool : it transforms community of strangers into a community of collaborators And wikipedia is really amazing...

3. Semantic wikis Next, semantic queries can be performed: [[LocatedIn::Europe]][[HasCapital::Paris]] Return the semantic wiki page « France ». Wikis can be used as knowledge base used by humans and computers...

4. Problems As a collaborative editing tool, wikis does not support Multi-synchronous editing [Dourish95] : Working activities proceed in parallel(multiple streams of activity), during which time the participants are disconnected (divergence occurs); and periodically their individual efforts will be integrated (synchronization) in order to achieve a consistent state and progress the activity of the group". From a single semantic wiki server to a network of semantic wiki server

5. A real problem ? Yes especially for semantic wikis... No transactional change support : Impossible to change several semantic wiki pages atomically Semantic wikis restructuration requires to change many pages atomically Intermediate state are visible to users and reasonners ! No process support: How to implement a simple edit/review/publish process ? Semantic wikis allow to build ontology, quality of the ontology is dependant of the process used to build this ontology.

6. How to provide multi-synchronous editing into semantic wikis ? It is enough to manage semantic pages with Distributed Version Control Systems such as Git, Mercurial, Bazaar... No : DVCS do not currently support Semantic data types DVCS only ensure Causality, CSCW researchers demonstrated that Causality, Convergence and Intentions are required for collaborative editing as in google wave for example.

7. Our approach : DSMW Distributed Semantic Media Wiki Build the multi-synchronous editing feature directly inside an existing semantic wiki (SMW) Multi-synchronous means: A network a semantic wikis servers (DSMW nodes) An update is produced on one server It is broadcasted to other servers Others servers receives and re-execute it The system (all network) is correct if it ensures CCI consistency.

8. DSMW approach The broadcast is based on the publish/subscribe model Server administrators can choose what they publish Server administrators can choose what they consume Correctness is based on the Logoot algorithm (ICDCS09). Logoot ensure CCI if broadcast ensures causality. We proved (in the paper) this is true, with our publish/subscribe mechanism.

9. DSMW ontology All elements are represented using Semantic wiki pages : available for requests...

10. How it works ? 2 pages with [[is in::tutorial]] annotations [[isin::tutorial]]

11. Create your feeds

12. Paches are semantics wikis pages

13. Now subscription and pull from another DSMW node...

14. Now you can make your own dataflows

15. Conclusion DSMW is an extension of SMW in order to allow multi-synchronous editing Isolated work and Transactional changes Dataflows DSMW = SMW + Logoot + publish/subscribe DSMW ensures CCI consistency DSMW stores its data as semantic pages in an ontology: Allows requests on pages and history of pages, exports... LGPL : https://dsmw.org (in construction...)https://dsmw.org

16. Perspectives Use the ontology of DSMW to compute new metrics for awareness Compute existing divergence metrics Compute new ones specific to fully decentralized work