SMIL When You Play That: A Gentle Introduction to SMIL + SVG
http://www.alistapart.com/stories/smil/

Zeldman, Jeffrey
List Apart, A
2001

Abstract:

SMIL is an easy-to-learn, HTML-like language for creating 'TV-like multimedia presentations such as training courses on the Web,' according to the W3C. The current SMIL recommendation is 1.0, and you can read all about it at the W3C address cited immediately above, and at another one we’ll mention later. This is our way of avoiding adding fifty pages to this article.