history

Hello,
I'm wondering whether anyone has, or knows how to implement or have
history in ark/arusha.
http://ark.sourceforge.net/ark-objects.html#avoid-chaos (para 2, point 1) 
suggests that this is being thought about/wanted/developed, but I can't
find any other references to it anywhere.

By history, I mean (at least) something like a changelog for an object,
that's actually kept with the object (or linked to it), rather than
implicitly in (say) the CVS changelog in the repository for the xml
files. Even better would be some kind of versioned view of an object
- e.g having (in the ark/xml description) something like "this was
version x.xx of foo, this is y.yy" and possibly some support for
generating a "diff" of sorts.

Hopefully I've not been too vague and someone understands what I'm
talking about, and even better, knows how to do it. Note that I'm
looking at rather than using ark/arusha at the moment, so feel free to
point me in the right direction if I've missed something.

Thanks.


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