We address the problem of indexing broadcast audiovisual documents such as films and newscasts. Starting from a collection of shots, we aim at building automatically high-level descriptions of subsets of this collection, that can be used for annotating, indexing and accessing the documents. We propose to represent documents and high-level descriptions with the framework of description logics, enriched with temporal relations. We first define the problem as a classification problem. We then propose an algorithm to automatically classify subsequences of shots, based on a bottom-up construction of descriptions using the rule mechansim of the CLASSIC system.