Merging two GNCBook* objects

[Derek Atkins]

linas at linas.org (Linas Vepstas) writes:

> On Fri, Apr 09, 2004 at 02:12:54PM -0400, Derek Atkins was heard to remark:
>> Neil Williams <linux at codehelp.co.uk> writes:
>> 
>> If the GUID matches it's the always same semantic object, regardless
>> of whether other data fields are changed.
>
> I having been toying with the idea of always adding a version
> number as a mandatory part of all objects, so that if you have
> two objects with the same guid, then you know which one is the more
> recent one.

I've been leaning towards a UTC timestamp instead of a version number.
Should do the same thing effectively, but lets you make multiple
changes without increasing the "version number" multiple times.  I
also think the backend should control the timestamp, not the
engine/cache.  The version/timestamp can be "modified" in the cache
during the commit_edit() phase.

-derek

-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord at MIT.EDU                        PGP key available