This article describes the current state of the art on representing the four essential conceptual facets of a multimedia unit, namely the form and substance of content and the form and substance of its expression, and points to the still unsolved problems regarding the syntax for media semantics. We irst provide a brief overview of the general features of the MPEG-7 standard and its different parts. This serves as a description of the state of the art in content description for audio-visual media. We then analyse the ability of one of these parts for its capability to define structures for describing media semantics
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