Hi Reza,
I'm writing on behalf of the Provenance Working Group with the group's response to your feedback. Paul Groth, who handled your comment originally, is traveling at the moment.
Thanks for your active engagement with helping improve W3C PROV. We have taken a look at your comment, in the email archived here:
http://lists.w3.org/Archives/Public/public-prov-comments/2012Sep/0002.html
which was made into a tracked issue on the PROV-CONSTRAINTS document here:
http://www.w3.org/2011/prov/track/issues/556
You can find our response here:
1.6.1 ISSUE-556 (time-qualification)
As part of the W3C process, we need to have an acknowledgement from you that our response solves your comment or if not a bit of description as to why. Could you provide that for us?
Thanks again for all your help,
--James