Trust and quality maintenance have always been problematic in the Web Sémantique RDF bases. Numerous propositions to address these problems of data integration have been made, either based on ontologies or on additional metadata. In this article we propose an original approach, based exclusively on data from the base, to evaluate the consistency of a candidate update to a RDF base, and finally to know if this update is relevant to the base. If the modifications of a candidate update make the target part of the base more similar to other part(s) of the base, then this candidate update is considered consistent with the base and can be applied.