12035 Generic collation element

I am going through the remaining 1.2 features trying
to make sure we understand them and their impact.  
As a result, I am sending out several messages, one
for each feature, with various comments in an attempt
to restart conversation on some of these.

Has there been any discussion of this beyond
http://lists.oasis-open.org/archives/dita/200703/msg00015.html

I'm not sure I understand what processing expectations
there are here.  I gather almost any element can have
a