The number and the heterogeneity of multimedia contents handled by information systems are increasing steeply. These contents are indexed in order to produce some metadata that are used during the retrieval process. However, several existing metadata standards can be used for describing the multimedia contents and choosing a particular one does not cover all the metadata features. A solution is the mixing of these standards and formats, but this does not ensure interoperability. To overcome this problem, we have proposed a metadata framework that could encapsulate the most common metadata standards. In this paper we present the validation of this framework in the context of the LINDO project.