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/2006/10/ttaf1 http://www.w3.org/2006/10/ttaf1#parameter http://www.w3.org/2006/10/ttaf1#parameter-extension http://www.w3.org/2006/10/ttaf1#styling http://www.w3.org/2006/10/ttaf1#styling-extension http://www.w3.org/2006/10/ttaf1#metadata http://www.w3.org/2006/10/ttaf1#metadata-extension
This namespace is not stable!