DITA 1.2 suggestion--add a class attribute to the dita element

["Grosso, Paul" <pgrosso@ptc.com>]

It seems as if specializating the dita element would be useful to allow 
individuals and organizations to add topic specializations and include 
them in a ditabase without having to include their specialization in all

ditabases.  So, the suggestion is to add a class attribute to the dita
element
so that it can be specialized.