if you look in the test cases there is a contract->version->effectiveness test that 
shows the classic pattern of effectivity of a business object over time with versions.

This is just the data model, of course, and you would need to manage creation of the 
versions and effectiveness objects, but that's pretty trivial.

-----Original Message-----
From: Robert r. Sanders [mailto:[EMAIL PROTECTED]
Sent: Friday, September 12, 2003 6:24 AM
To: OJB Users List
Subject: Re: versioning and OJB


Depends on what type you mean.  I have thought some on the subject of 
versioning objects and any subobjects; to provide a tag/milestone based 
versioning.  First, it seems to me that this would be a fairly 
significant project; best built as a module running on top of the OJB 
core.  Second, it the complexity (and DB space) could become very large 
depending on the number of feature required.  Finally, it seems to me, 
that most of the complexity could be hidden inside of a sufficently 
sophisticated versioning module that used OJB's metadata to save just 
the column values that changed, but I am not familiar with the theory 
behind versioning systems.

Anton Komratov wrote:

>Are there any thoughts how to implement versioning using OJB?
>
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-- 
    Robert r. Sanders
    Chief Technologist
    iPOV
    www.ipov.net



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