Paolo Baggia; Frank Scahill. <a href="http://www.w3.org/TR/2004/WD-lexicon-reqs-20041029"><cite>Pronunciation Lexicon Specification (PLS) Version 1.0 Requirements.</cite></a> 29 October 2004. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2004/WD-lexicon-reqs-20041029">http://www.w3.org/TR/2004/WD-lexicon-reqs-20041029</a>