Hala Skaf-Molli

Associate Professor Nantes University, HDR, (holder of the scientific excellence distinction),
Member of GDD Team at Lina LINA
2, rue de la Houssinière \\ 44322 Nantes cedex 03, France
Tél. : +33 (0) 2 51 12 58 93
Fax. : +33 (0) 2 51 12 58 12


Hala Skaf-Molli received a HDR from the University of Nantes in 2017. She had a PhD in Computer Science from the University of Nancy, France in 1997. From 1998 to September 2010, she was an Associate Professor at the University of Nancy and member of the LORIA. Since October 2010, she is an Associate Professor at the University of Nantes and a member of the GDD Team at Lina LINA. Dr. Skaf-Molli has mainly worked on distributed semantic data management problems. She has proposed algorithmes for synchronization Distributed Semantic Wikis, RDF data and making LOD writable. She proposed also new mediator-based approaches for querying the Deep Web and Linked Data, and new algorithms for querying SPARQL federations with replicated RDF fragments. Dr. Skaf-Molli has published more than 80 research papers and has served in Program Committee of more than 20 conferences and workshops. She has participated in national projects Kolflow, SocioPlug and international projects Corvette with Hitachi Japan, and coordinate LodPaddle selected by the FP7? European Lod2 project.

Habilitation à Diriger de Recherche (HDR):

Recent Papers:

  • The Odyssey Approach for Optimizing Federated SPARQL Queries. Gabriela Montoya, Hala Skaf-Molli, and Katja Hose. Odyssey Slides, ISWC2017?.
  • PeNeLoop?: Parallelizing federated SPARQL queries in presence of replicated fragments. Thomas Minier, Gabriela Montoya, Hala Skaf-Molli

and Pascal Molli. PeNeLoop? QuWeDa?@ESWC 2017. Slides

Distributed Semantic Wikis Papers

  • Distributed Semantic MediaWiki (DSMW)] (Released in LGPL (October 2009): DSMW is an extension of Semantic Mediawiki (SMW). It allows to create a network of SMW servers that share common semantic wiki pages. DSMW manages synchronisation of shared semantic pages and ensures CCI consistency. CCI stands for Causality, Convergence, Intentions. DSMW provides to SMW nearly the same features as a Distributed Version Control systems. It uses a semantic publish/Subscribe mechanism to propagate modifications.
    • Paper : Multi-synchronous Collaborative Semantic Wikis Charbel Rahhal, Hala Skaf-Molli, Pascal Molli and Stéphane Weiss. In Wise'09: International Conference on Web Information Systems, 2009.
    • Demo: Distributed Semantic MediaWiki Hala Skaf-Molli, Gérôme Canals and Pascal Molli. Demonstration in 7th Extended Semantic Web Conference 2010.
    • Peer-to-peer Semantic Wikis(SWOOKI)is a Peer-to-peer network of autonomous semantic wiki servers (called also peers or nodes) that can dynamically join and leave the network. Every peer hosts a copy of all semantic wiki pages and an RDF store for the semantic data. Every peer can autonomously offer all the services of a semantic wiki server. When a peer updates its local copy of data, it generates a corresponding operation. This operation is broadcasted through the P2P? network to all other peers to be integrated.
    • Paper :Peer-to-peer Semantic Wikis. Hala Skaf-Molli, Charbel Rahhal and Pascal Molli. In DEXA'09: 20th International Conference on Database and Expert Systems Applications , Linz, Austria , August 2009.
    • Paper: SWooki: Un Wiki Sémantique sur réseau Pair-a-Pair. Rahhal, Charbel, Skaf-Molli, Hala and Molli, Pascal . Ingénierie des Systèmes d'Information, 14(1), 2009
    • Demonstration :SWooki: Supporting Disconnection in a Peer-to-peer Semantic Wiki. Hala Skaf-Molli, Pascal Molli and Gérome Canals. In Demonstration at 5éme Journées Francophones : Mobilité et Ubiquité - UbiMob?? 2009
    • Paper :Undo in Peer-to-peer Semantic Wikis. Charbel Rahhal, Stéphane Weiss, and Hala Skaf-Molli, Pascal Urso and Pascal Molli. In SemWiki?? 2009 - 4rd Semantic Wiki Workshop at the 6th European Semantic Web Conference (ESWC 2009) , page 18 , Heraklion, Greece , May 2009

Graduate and Post Graduate Students( PhD)

Ongoing Thesis:

  1. Co-advisor of PhD thesis Pauline Folz, started in 2014, funding by Cifre Bourse of Nantes Metrople. Pauline is working on federation of Open data and Linked Open Data.CYCLDES project
  2. Co-advisor of PhD thesis Gabriela Motoya, started in 2013, funding by CNRS. Gabriela is working on Federated SPARQL Queries Processing with Replicated RDF Fragments

Past Thesis

  1. Co-advisor Luis Daniel Ibáñez, started before end of 2010, advisor Pascal Molli, funding ANR Folflow : Luis is working on making Linked Data Writable.
  2. Co-advisor of PhD thesis Diego Torres, started before end of 2010, co-tutelle with Alicia Diaz, advisor Pascal Molli. Diego is working on enriching Social Web with Knowledge from Semantic Web. He proposes a cooperative recommender system to improve Wikipedia with properties of DBPedia?.
  3. Co-advisor of PhD thesis Khaled Mobayed, started before end of 2009, advisor Pascal Molli. Title: Divergence Awareness in Distributed Multi-Synchronous Collaborative Systems. Defended: 21 October 2012.
  4. Co-director of PhD thesis of Charbel Rahhal, Title: Wikis sémantiques sur réseaux pair-à-pair. Director: Pascal Molli

Master 2 research thesis

  1. Master Gaétan GAUTIER (2013-2014): Federation of Semantic Wikis
  2. 2009-2010: Diego Torres, Personal knowledge Management in Distributed Semantic Wiki, in collaboration with the University la Plata, Argentine.
  3. 2009-2010: Nagham Haddad, Divergence Awareness in Distributed Semantic MediaWiki?
  4. Master Doratti RAZAFIMAHATRATRA (2003-2004): Réparation automatique dans un environnement collaboratif Raport in French

Past responsibility

Program Committee


  • DEXA2014 :25th International Conference on Database and Expert Systems Applications


  • SWCS 2013 : Semantic Web Collaborative Spaces (Workshop of ESWC2013), Montpellier , France, 2013.
  • RED13: Sixth International Workshop on Resource Discovery in conjunction with the 9th Extended Semantic Web Conference (ESWC 2012), Montpellier , France, 2013.
  • http://www.irit.fr/globe13/ |Globle13]]: 6th International Conference on Data Management in Cloud, Grid and P2P? Systems (Globe 2013).
  • ICEIS2013 : 15th International Conference on Enterprise Information Systems, Angers, France.


  • SWCS 2012 : Semantic Web Collaborative Spaces (Workshop of WWW2012), Lyon, France, 2012,
  • EKAW12 : The 18th International Conference on Knowledge Engineering and Knowledge Management, Ireland, 2012, Poster and Demo program committee
  • RED12: Fifth International Workshop on Resource Discovery in conjunction with the 9th Extended Semantic Web Conference (ESWC 2012), Greece, 2012.
  • CIIA'12 : Third International Conference on Computer Science and its Applications Saida, Algeria, 2012,
  • ICEIS2012 : 14th International Conference on Enterprise Information Systems, Poland, 2012,






2006 and before...

Organization Committee

  • BDA2013 : 29ème Journée de Bases de Données Avancées, 2013, Nantes, France.






Ongoing Projects

Finished Projects

  • CyWiki? : vers une forge de la connaissance, projet associant les laboratoires LORIA, ATILF, LISEC et le Service Nutice. Project financé par l'appel à projets 2009 lancé par le CCOSL
  • Projet exploratoire ISCC 2009,CNRS, P2CeL? – Collaborative Knowledge Construction and E-Learning: An Approach Based on Semantic Wikis." http://www.thermoptim.org/sections/enseignement/communaute-p2cel (in french)
  • Project TALC du CPER MISN :"Vers un wiki sémantique pour la gestion des connaissances d’un système de raisonnement à partir de cas." http://wikitalc.loria.fr/dokuwiki/doku.php?id=operations:wikisem (in french)
  • Pré-opération MSH 2009
  • Project Seyct (2008-2010), with La Plata University, Argentina.
  • Responsable of Projet Rorax (2006-2008), French/Libanese program CEDRE
  • Member of ARC INRIA Recall (2005), http://recall.loria.fr. Recall is funding the development of Wooki.
  • Member of Gdr-PRC I3 (2003-2004)
  • Member of action VXP (2001-2003), CPER QSL. VXP has funded the development of SAMS.
  • Member of action Mobi5 (2004,2006), CPER QSL. Mobi5 has funded the development of So6.
  • Member of Project Corvette with Hitachi, Japon http://www.loria.fr/equipes/ecoo/corvette/. The objective is to build a Collaborative Workflow Systems.
  • Australian Research Council IREX Grant with University of New South Wales, Sydney

Scientific Collaboration

  • Maria Esther-Vidal, Professor at the University Simón Bolívar, Caracas, Venezuela. Working on SPARQL Federation.
  • Olivera Marjovic, University of Sydney, Australia. Working on Collaborative Learning.
  • Hala Naja-Jazzar, University Libanese, Liban. Working on Collaborative Editing of XML Documents.
  • Nishadi di-Silva, University of Southompthon, England. Working on Narrative-based collaborative Writing and Semantic Consistency.
  • Alicia Diaz, University of La plata, Argentina. Working on personal knowledge in P2P? semantic wikis.

Previous Master research Subject