[xliff] Updated 1.1 issues tracking document

R.1 a mechanism to allow defaulting for

 XLIFF data categories

  

R.2 formal representation of data category

is secondary (i.e. the mechanism should 

be applicable to attributes and elements)

  

R.3 mechanism should work for all XLIFF 

data categories

  

R.4 location for defaulting information 

is secondary (i.e. default in central 

location, default at specific attributes or

elements, and default at all attributes 

and elements is acceptable)