The W3C Voice Browser Working Group has published a note on SSML 1.0 say-as attribute values. "The say-as element in SSML 1.0 is considered one of the most useful elements of the language. However, SSML 1.0 does not define the values of the attributes of this element. This Note provides definitions for these attributes that cover many of the most common use cases for the say-as element."