[imsc] No text describing default namespace used in spec

nigelmegitt has just created a new issue for 
https://github.com/w3c/imsc:

== No text describing default namespace used in spec ==
There are places in the spec where the main TTML namespace (usually 
written as `tt`) is omitted, such as §6.9:

> The `ttp:profile` attribute should be present on the `tt` element 
...

Related to this, we seem to have omitted the TT namespace from the set
 listed in §6.3 Namespaces - it should be added.

I can't see any wording that says that if namespace is omitted then 
the TTML namespace is intended - I suggest adding either to §6.3 
Namespaces or to §2 Document Conventions something like [TTML 1 
§5.1](https://www.w3.org/TR/ttml1/#vocabulary-namespaces): 

> If a reference to an element type is used in this specification and 
the name of the element type is not namespace qualified, then the TT 
Namespace applies.

alternatively we could fully qualify all element names.

Please view or discuss this issue at 
https://github.com/w3c/imsc/issues/174 using your GitHub account

Received on Friday, 19 February 2016 10:07:21 UTC