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!