periodical in DocBook?

Folks,

I would like to re-propose periodical be added to DocBook with the 
following requirements:

"A periodical is a collection of articles, the way a book is a 
collection of chapters, to encapsulate documents released on a recurring 
basis e.g., technical journals, newsletters, and more.

The element should be allowed in set to allow for archives or other 
groupings of periodicals."

Previously, we (the DocBook TC) rejected the proposal (see 
https://sourceforge.net/tracker/?func=detail&atid=384107&aid=1440204&group_id=21935)

With the advent of native-XML databases and XQuery, I think it would be 
a very useful distinction to quickly narrow the content set being 
searched (assuming you had a mix of book and periodical content in said 
db). Additionally, there may be styling and rendering advantages with 
the distinction.

I'd like to get specific requirements and usage examples before 
submitting a new RFE. Please let me know your thoughts!

Would the distinction between book and periodical be useful?

If so, are there any additional requirements for a periodical that are 
not quite met by the book model?

Thanks and best regards,

--Scott Hudson