Clarification of <itemgroup>

The 1.1 description of <itemgroup> says:

"The <itemgroup> element is reserved for use in specializations of DITA. 
As a container element, it can be used to sub-divide or organize 
elements that occur inside a list item, definition, or parameter 
definition."

However, it is allowed within <p> and is, as far as I can tell, the only 
element from which one can create sub-para specializations that allow 
all things valid within <p>.

I think that the description should be extended to include "p" in the 
list that is currently "list item, definition, or parameter definition", 
given that each of these is, logically, a specialization of paragraph 
(even though they aren't necessarily literally specializations of <p>).

Cheers,

Eliot