EMMA (Extensible MultiModal Annotation) is a standard which was developed by the W3C Multimodal Interaction Working Group. It's primary purpose is to provide a way to represent user inputs in an interoperable way, especially inputs from different modalities in a multimodal application, using XML. If you're interested in how an EMMA document looks, you can try out some examples here. The publication of EMMA as a standard was covered in the March 1 2009 issue of Software Development Times.
Here are 60 EMMA documents for a music request application in a single file. These were used as the basis for the 2009 SpeechTEK New York presentation "Improving Dialogs with EMMA" and was used in the SpeechTEK New York 2010 "Targeted Training" session on EMMA. You can also see the demos from the targeted training session.
An overview poster on EMMA was presented at the 10th International Conference on Intelligent Virtual Agents in Philadelphia, September 20-22, 2010.
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