Synchronized Multimedia Integration Language - SMIL, pronounced "smile"
An XML-based language that allows authors to write interactive multimedia presentations.
An author can:
Describe the temporal behavior of a multimedia presentation Associate hyperlinks with media objects Describe the layout of the presentation on a screenIt will allow reuse of syntax and semantics in other XML-based languages
Of particular usefulness for those who need to represent timing and synchronization.
Components are used for integrating timing into XHTML and into SVG.
http://www.w3.org/TR/2001/PR-smil20-20010605/introduction.html