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Data warehouses are used in many domains. Their purpose is to store historical data and to assist in the decision making process. Multimedia data warehouses are used for storing files which contain texts, graphics, videos and sound. These kinds of files are produced in large quantities, in fields such as medicine or space research. We propose a framework for building such a data warehouse, structuring the data in a familiar way, for a warehouse user. We present a hierarchical way of structuring the data and the information extracted. We also propose a method of semantically enhancing the data and the information extraction process with the use of hierarchical metadata.