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Synchronized Multimedia Integration Language (SMIL) enables simple authoring of TV-like multimedia presentations such as training courses on the Web
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Image and other specialized media descriptors
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enable storing of multiple resolutions (image) or multiple video codecs and optimized access
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More generally perhaps universalaccessML will allow one to support different renderings of an object needed for different users and clients
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palmtops versus PC's
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audio versus image for visually impaired users
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"People" including students, teachers, administrators
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"Bibliographic" descriptors as in Dublin Core
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CollaborationML as in NPAC's SPW (Shared Portal on the Web)
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