[Details] an ECMAScript expression which returns a character string that specifies the MIME type of the document, and as a result, which dialog interpreter is actually loaded. A MIME type of "application/xml+vxml" associates the start-document with a VoiceXML interpreter instance. A MIME type of "audio/wav" associates the start-document with a dialog manager that merely plays wave files. If omitted, the mime-type attribute defaults to "application/xml+vxml", but the CCXML interpreter is free to guess the correct MIME type, e.g., by examining the filename-extension of the start-doc URI. [Attribute Name] 
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