Philipp Hoschka. <a href="http://www.w3.org/TR/1998/REC-smil-19980615"><cite>Synchronized Multimedia Integration Language (SMIL) 1.0 Specification.</cite></a> 15 June 1998. W3C Recommendation. URL: <a href="http://www.w3.org/TR/1998/REC-smil-19980615">http://www.w3.org/TR/1998/REC-smil-19980615</a>