- OOA: The Ontology Outreach Advisory.
 - Paper: Formalizing ORM using SHOIN/OWL.
 - Paper: Formalizing ORM using the DLR description logic.
 - Paper: Pattern-based Reasoning for Friendly Ontology Debugging
 - Paper:An Ontology for Customer Complaint Management.
 - Paper:Ontology Engineering -The DOGMA Approach.
 - PhD Thesis -Towards Methodological Principles for Ontology Engineering.

Semantic Data Mashups:
  - Semantic Pipes with SPARQL, query distribution, optimization, and Caching
  - MashQL a Query-by-Diagram Language toping SPARQL.
  - Entity Identification, Resolution, and Portability.

Ontology/Knowledge Engineering:
  - Philosophical and Logical foundations of ontology engineering.
  - Ontology Multilingualism and lexical semantics.
  - Methodology and Tools, Reasoning, Modularization, Context, Gloss ...
  - Regulatory/legal Ontologies; Business Ontologies; Innovation Ontologies.

Database and Conceptual modeling (Object-Role Modeling (ORM)):
  - Extending conceptual modeling languages to allow focusing on the factual meaning and intrinsic properties.
  - Logical Reasoning, mapping conceptual modeling languages into Description Logics.
  - Schema Engineering: modularization, composition, verbalization, and business rules.

              Articles ,   Reports ,     Presentations

Ongoing:
  SEARCHiN: (EU Marie Curie actions) SEARCHing In a Networked world.
Past:
   Knowledge Web: (EU funded) Supporting the transition process of Ontology technology from Academia to Industry.
   Innovanet : (EU funded) Knowledge discovery lifecycle and knowledge innovation management.
   CCFORM: (EU funded) Consumer Complaints Resolution Mechanism.
   OntoWeb: (EU) Ontology-based Information Exchange for Knowledge Management and Electronic Commerce.
   Namic: (EU funded) Intelligent Services to News Agencies.
   IrisWeb: (DWTC funded) Ontology-supported ways to perform browsing in a (digital) library.
   POLARIS: (VUB funded) A prototype of a next generation Digital University Library system.
   DOGMA: (VUB funded) Developing Ontology-Guided Mediation of Applications. A framework for engineering and deploying formal ontologies.

Activities (Selected)

Conference Calendar
Organizer/Program Chair:
- OnToContent 08- International Workshop on Ontology content and evaluation. Monterrey, Mexico.
- OnToContent 07- International Workshop on Ontology content and evaluation. Albufeira, Portugal.
- OnToContent 06- International Workshop on Ontology content and evaluation. Montpellier, France.
- OOA-HR, Semantic challenges and opportunities in the Human Resources Domain. Oxford, UK.
- SWWS'06, The IFIP WG 2.12 and WG 12.4 Workshop on Web Semantics. Montpellier, France.
- WORM-05, The third International Workshop on Regulatory Ontologies. Larnaca, Cyprus.
- SWWS'05, The IFIP WG 2.12 and WG 12.4 Workshop on Web Semantics. Larnaca, Cyprus.
- WORM-04, The second International Workshop on Regulatory Ontologies. Larnaca, Cyprus.
- WORM-03, The first International Workshop on Regulatory Ontologies. Catania, Sicily, Italy.
- OMAC, Workshop on Ontology Modularization and context. Brussels, Belgium

Full Member:
- The Ontology Outreach Advisory, 2006. (Cofounder and the secretariat)
- IEEE, Learning Technology Standards Committee.
- the CEN/ISSS, ICT Skills and Curricula.
- IFIP Working Group 2.6 on Databases.
- IFIP Working Group 2.12 on Web Semantics.
- PEA, Palestine Engineers' Association.

Referee/PC member
- Springer book publishing proposals.
- Journal of Applied Ontology.
- Journal of Knowledge Engineering Review.
- Journal of Data and Knowledge Engineering Journal, DKE. (Regular Referee)
- Journal IEEE Transactions on Knowledge and Data Engineering.
- Journal Advances in Engineering Software, Special Issue on Vocabularies, Ontologies and Rules.
- Journal of Artificial Intelligence Tools, IJAITS.
- Journal of Visual Languages and Computing,Special Issue on Perception and ontologies in visual, virtual and geographic spaces.
- Journal on Web Semantics.
- Journal of IEEE Software.
- Journal of Semantic Web and Information Systems.
- Journal of Electronic Commerce Research and Applications, special issue on Semantic Web Rules/Agents.
- Journal on Data Semantics.

- ICIS'08, International Conference on Information Systems.
- FLOW'08, International Workshop on Fuzzy Logic On the Web.
- CBMS'08, The 21st IEEE International Symposium on Computer-Based Medical Systems.
- ORM'08, Workshop on Object-Role Modeling.
- WOMSDE'08, Workshop on Ontologies and Metamodeling in Software and Data Engineering .
- VORTE'08, EDOC International Workshop on Vocabularies, Ontologies and Rules for The Enterprise.
- SWAE'2008, The 1st International Workshop on Semantic Web Architectures For Enterprises.
- ESAS'08, The 3rd IEEE International Workshop on Engineering Semantic Agent Systems.
- ESWC'07, The 4th European Semantic Web Conference.
- ESAS'07, International Workshop on Engineering Semantic Agent.
- SWAE'2007, The 1st International Workshop on Semantic Web Architectures For Enterprises.
- BADE 2007, IEEE Workshop on Biomedical Applications for Digital Ecosystems.
- ORM'7, Workshop on Object-Role Modeling.
- VORTE'07, EDOC International Workshop on Vocabularies, Ontologies and Rules for The Enterprise.
- SWWS'07, IFIP WG 2.12 & WG 12.4 Workshop on Web Semantics.
- SAMI'07, the Third IEEE Workshop on Situation Management.
- LOAIT'07, International Workshop on Legal Ontologies and Artificial Intelligence Techniques.
- ICDM'06, The IEEE Workshop on Data Mining in Bioinformatics.
- CBMS'06, The 19th IEEE International Symposium on Computer-Based Medical Systems.
- WOMSDE'06, The 1st Workshop on Ontologies and Metamodeling in Software and Data Engineering.
- ORM'6, Workshop on Object-Role Modeling.
- SWWS'06, IFIP WG 2.12 & WG 12.4 Workshop on Web Semantics.
- SWIG06, The Canadian Semantic Web Working Symposium 2006.
- DMB'06, IEEE ICDM 2006 Workshop on Data Mining in Bioinformatics.
- VORTE'06, EDOC International Workshop on Vocabularies, Ontologies and Rules for The Enterprise.
- ESAS'06, International Workshop on Engineering Semantic Agent.
- ESWC'06, Industry Forum.
- ODBase'05, International Conference on Ontologies, Databases and Applications of SEmantics.
- ORM'5, Workshop on Object-Role Modeling.
- SWWS'05, IFIP WG 2.12 & WG 12.4 Workshop on Web Semantics.
- VORTE'05, EDOC International Workshop on Vocabularies, Ontologies and Rules for The Enterprise.
- LOAIT'05, International Workshop on Legal Ontologies and Artificial Intelligence Techniques.
- SWCASE'05 Semantic Web Case Studies and Best Practices for eBusiness.
- ESWC'05 Industry Forum.
- IKE, The 2004 International Conference on Information and Knowledge Engineering.
- SWEB 2004, International Workshop on Semantic Web Technologies in Electronic Business.
-  + others

- DogmaModeler (an ontology modeling tool based on ORM)
- ORM Markup language 3 (an XML-based serialization for ORM diagrams)
- ORM verbalizor (Multilingual verbalization for ORM in 11 languages)
- CContology An ontology for Customer Complaint Management