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Access Aids: The Role of Audio and Music Descriptors (MPEG 7)

Acoustics Research Institute of the Austrian Academy of Sciences, Liebiggasse 5, A-1010 Vienna Phone: 043-1-4277-29500 Fax: 043-1-4277-9296 Email: wad@kfs.oeaw.ac.at http//www.kfs.oeaw.ac.at

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MPEG 7 will further promote the development of access tools which can be written in XHTML and XML conforming. XHTML is a family of current and future document types and modules that reproduce, subset, and extend HTML 4.0. XHTML family document types are XML-based, and ultimately are designed to work in conjunction with XML-based user agents. XHTML 1.0 is a reformulation of the three HTML 4.0 document types as applications of XML 1.0. It is intended to be used as a language for content that is both XML-conforming and, if some simple guidelines are followed, operates in HTML 4.0 conforming user agents.

• XHTML documents are XML conforming. As such, they are readily viewed, edited, and validated with standard XML tools.
• XHTML documents can be served as media type text/html and will continue to operate as well or better than they did before in existing HTML 4.0-conforming user agents as well as in new, XHTML 1.0 conforming user agents.
• XHTML documents can also be served as media type text/xml or media type application/xml, with appropriate style sheet support, will operate just as well in XML-based user agents as they do in HTML-based user agents.
• XHTML documents can utilize applications (e.g. scripts and applets) that rely upon either the HTML Document Object Model or the XML Document Object Model.
• As the XHTML family evolves, documents conforming to XHTML 1.0 will be more likely to interoperate within and among various XHTML environments.