This is a placeholder for a namespace document that permits
dereferencing the Timed Text (TT) Authoring Format V1.0
Distribution Format Exchange Profile namespace URIs:

http://www.w3.org/2004/11/ttaf1-dfxp
http://www.w3.org/2004/11/ttaf1-dfxp#style
http://www.w3.org/2004/11/ttaf1-dfxp#style-extension
http://www.w3.org/2004/11/ttaf1-dfxp#metadata
http://www.w3.org/2004/11/ttaf1-dfxp#metadata-extension

This namespace document is expected to be replaced by a
W3C XML Schema document.