Abstract
This thesis presents an approach and tools for annotating documents with ontologies. In our context, this problem is regarded as annotating documents using a set of concepts that belong to a domain ontology. We deal with this problem by developing an approach based on the citation relationship. This relation is the core of a method to refine propagation of annotations between the documents. The approach is independent from documents content and uses clusters of references that are buillt with unsupervised fuzzy classification. We also considered the problem of updating the ontology in order to be able to take into account the various evolutions of documents and to refine the annotation step. A tool, named RAS,Reference System Annotation, has been developed and experiments were realized byusing the Citeseer base.<br />Documents annotation with citation context based on ontology.